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AUSCERT External Security Bulletin Redistribution
ESB-2021.1250
USN-4907-1: Linux kernel vulnerabilities
14 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Linux kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Unauthorised Access -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-26931 CVE-2021-26930 CVE-2021-20268
CVE-2021-20239 CVE-2021-20194 CVE-2021-3348
CVE-2021-3347 CVE-2021-3178 CVE-2018-13095
Reference: ESB-2021.1228
ESB-2021.1101
ESB-2021.0920
Original Bulletin:
https://ubuntu.com/security/notices/USN-4907-1
https://ubuntu.com/security/notices/USN-4909-1
https://ubuntu.com/security/notices/USN-4910-1
Comment: This bulletin contains three (3) Ubuntu security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
USN-4907-1: Linux kernel vulnerabilities
13 April 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
o Ubuntu 14.04 ESM
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
o linux-dell300x - Linux kernel for Dell 300x platforms
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
o linux-kvm - Linux kernel for cloud environments
o linux-oracle - Linux kernel for Oracle Cloud systems
o linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
o linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors
Details
Wen Xu discovered that the xfs file system implementation in the Linux
kernel did not properly validate the number of extents in an inode. An
attacker could use this to construct a malicious xfs image that, when
mounted, could cause a denial of service (system crash). ( CVE-2018-13095 )
It was discovered that the priority inheritance futex implementation in the
Linux kernel contained a race condition, leading to a use-after-free
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. ( CVE-2021-3347 )
It was discovered that the network block device (nbd) driver in the Linux
kernel contained a use-after-free vulnerability during device setup. A
local attacker with access to the nbd device could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
( CVE-2021-3348 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o linux-image-powerpc-e500mc - 4.15.0.141.128
o linux-image-4.15.0-1098-aws - 4.15.0-1098.105
o linux-image-gcp-lts-18.04 - 4.15.0.1097.115
o linux-image-aws-lts-18.04 - 4.15.0.1098.101
o linux-image-oracle-lts-18.04 - 4.15.0.1069.79
o linux-image-virtual - 4.15.0.141.128
o linux-image-4.15.0-1089-kvm - 4.15.0-1089.91
o linux-image-4.15.0-1100-snapdragon - 4.15.0-1100.109
o linux-image-snapdragon - 4.15.0.1100.103
o linux-image-4.15.0-141-lowlatency - 4.15.0-141.145
o linux-image-powerpc64-emb - 4.15.0.141.128
o linux-image-4.15.0-1083-raspi2 - 4.15.0-1083.88
o linux-image-dell300x - 4.15.0.1016.18
o linux-image-4.15.0-1069-oracle - 4.15.0-1069.77
o linux-image-generic - 4.15.0.141.128
o linux-image-4.15.0-1112-azure - 4.15.0-1112.125
o linux-image-4.15.0-1016-dell300x - 4.15.0-1016.20
o linux-image-kvm - 4.15.0.1089.85
o linux-image-raspi2 - 4.15.0.1083.80
o linux-image-azure-lts-18.04 - 4.15.0.1112.85
o linux-image-powerpc-smp - 4.15.0.141.128
o linux-image-4.15.0-141-generic-lpae - 4.15.0-141.145
o linux-image-generic-lpae - 4.15.0.141.128
o linux-image-4.15.0-141-generic - 4.15.0-141.145
o linux-image-powerpc64-smp - 4.15.0.141.128
o linux-image-4.15.0-1097-gcp - 4.15.0-1097.110
o linux-image-lowlatency - 4.15.0.141.128
Ubuntu 16.04
o linux-image-gke - 4.15.0.1097.98
o linux-image-oracle - 4.15.0.1069.57
o linux-image-4.15.0-1098-aws - 4.15.0-1098.105~16.04.1
o linux-image-4.15.0-1069-oracle - 4.15.0-1069.77~16.04.1
o linux-image-gcp - 4.15.0.1097.98
o linux-image-4.15.0-1112-azure - 4.15.0-1112.124~16.04.1
o linux-image-4.15.0-1097-gcp - 4.15.0-1097.110~16.04.1
o linux-image-azure - 4.15.0.1112.103
o linux-image-aws-hwe - 4.15.0.1098.91
Ubuntu 14.04
o linux-image-azure - 4.15.0.1112.85
o linux-image-4.15.0-1112-azure - 4.15.0-1112.124~14.04.1
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References
o CVE-2021-3347
o CVE-2021-3348
o CVE-2018-13095
Related notices
o USN-4904-1 : linux-image-4.4.0-1154-snapdragon, linux-raspi2,
linux-image-raspi2, linux-image-aws, linux-image-4.4.0-1126-aws,
linux-image-4.4.0-208-lowlatency, linux-image-lowlatency-lts-xenial,
linux-image-4.4.0-1150-raspi2, linux-image-4.4.0-208-powerpc64-smp,
linux-image-generic-lpae-lts-xenial, linux-image-generic-lts-xenial,
linux-image-snapdragon, linux-lts-xenial, linux-image-virtual-lts-xenial,
linux-image-powerpc64-emb, linux-kvm, linux-image-virtual,
linux-image-4.4.0-208-powerpc64-emb, linux-image-4.4.0-1090-aws, linux-aws,
linux-image-4.4.0-208-generic, linux-image-powerpc64-smp,
linux-image-4.4.0-208-powerpc-e500mc, linux-image-generic,
linux-image-4.4.0-208-powerpc-smp, linux-image-powerpc-smp,
linux-image-powerpc-e500mc, linux-snapdragon, linux,
linux-image-lowlatency, linux-image-kvm,
linux-image-4.4.0-208-generic-lpae, linux-image-4.4.0-1091-kvm,
linux-image-generic-lpae
o USN-4910-1 : linux-image-5.8.0-1025-oracle, linux-image-generic-hwe-20.04,
linux-hwe-5.8, linux-gcp, linux-image-5.8.0-49-generic, linux-image-aws,
linux-image-5.8.0-1020-raspi-nolpae, linux-image-5.8.0-49-generic-64k,
linux-image-raspi-nolpae, linux-image-5.8.0-1027-azure,
linux-image-generic-64k, linux-image-gke, linux-image-virtual-hwe-20.04,
linux-image-5.8.0-1028-aws, linux-image-azure, linux-image-generic-lpae,
linux-kvm, linux-image-virtual, linux-aws,
linux-image-5.8.0-49-generic-lpae, linux-image-5.8.0-1020-raspi,
linux-image-5.8.0-49-lowlatency, linux-image-generic, linux-oracle,
linux-image-generic-lpae-hwe-20.04, linux-image-generic-64k-hwe-20.04,
linux-image-5.8.0-1023-kvm, linux-raspi, linux-image-oracle,
linux-image-gcp, linux, linux-image-lowlatency, linux-image-kvm,
linux-image-raspi, linux-azure, linux-image-lowlatency-hwe-20.04,
linux-image-oem-20.04, linux-image-5.8.0-1027-gcp
o USN-4878-1 : linux-image-5.4.0-1039-oracle, linux-gcp, linux-image-raspi2,
linux-image-aws, linux-raspi-5.4, linux-azure-5.4, linux-image-oem-osp1,
linux-image-raspi-hwe-18.04, linux-image-snapdragon-hwe-18.04,
linux-hwe-5.4, linux-image-azure, linux-kvm, linux-image-virtual,
linux-image-5.4.0-1039-aws, linux-image-5.4.0-67-generic,
linux-image-generic-lpae-hwe-18.04, linux-image-azure-edge,
linux-image-5.4.0-1034-kvm, linux-aws, linux-image-generic, linux-oracle,
linux-image-gcp-edge, linux-image-virtual-hwe-18.04, linux-image-gkeop,
linux-raspi, linux-image-gke-5.4, linux-image-oracle, linux-image-aws-edge,
linux-gcp-5.4, linux-aws-5.4, linux-image-gcp, linux, linux-gkeop-5.4,
linux-image-5.4.0-1041-azure, linux-image-5.4.0-1037-gke,
linux-image-5.4.0-67-generic-lpae, linux-image-lowlatency, linux-image-kvm,
linux-image-5.4.0-1011-gkeop, linux-image-raspi,
linux-image-5.4.0-67-lowlatency, linux-image-5.4.0-1030-raspi,
linux-oracle-5.4, linux-azure, linux-gke-5.4,
linux-image-generic-hwe-18.04, linux-image-5.4.0-1038-gcp,
linux-image-gkeop-5.4, linux-image-oem, linux-gkeop,
linux-image-lowlatency-hwe-18.04, linux-image-generic-lpae
o USN-4909-1 : linux-gcp, linux-image-5.4.0-71-generic, linux-image-raspi2,
linux-image-aws, linux-raspi-5.4, linux-azure-5.4, linux-image-oem-osp1,
linux-image-5.4.0-1042-oracle, linux-image-raspi-hwe-18.04,
linux-image-5.4.0-1040-gke, linux-image-snapdragon-hwe-18.04,
linux-image-5.4.0-1044-azure, linux-hwe-5.4, linux-image-azure,
linux-image-5.4.0-71-generic-lpae, linux-kvm, linux-image-5.4.0-1037-kvm,
linux-image-virtual, linux-image-generic-lpae-hwe-18.04, linux-aws,
linux-image-generic, linux-oracle, linux-image-5.4.0-1013-gkeop,
linux-image-virtual-hwe-18.04, linux-image-gkeop, linux-raspi,
linux-image-gke-5.4, linux-image-oracle, linux-image-gcp, linux-gcp-5.4,
linux-aws-5.4, linux, linux-gkeop-5.4, linux-image-5.4.0-1041-gcp,
linux-image-5.4.0-1043-aws, linux-image-5.4.0-1033-raspi,
linux-image-lowlatency, linux-image-kvm, linux-oracle-5.4,
linux-image-raspi, linux-azure, linux-gke-5.4,
linux-image-generic-hwe-18.04, linux-image-gkeop-5.4, linux-image-oem,
linux-gkeop, linux-image-lowlatency-hwe-18.04,
linux-image-5.4.0-71-lowlatency, linux-image-generic-lpae
o USN-4884-1 : linux-image-5.10.0-1017-oem, linux-oem-5.10,
linux-image-oem-20.04b
- --------------------------------------------------------------------------------
USN-4909-1: Linux kernel vulnerabilities
13 April 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-aws-5.4 - Linux kernel for Amazon Web Services (AWS) systems
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gcp-5.4 - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gke-5.4 - Linux kernel for Google Container Engine (GKE) systems
o linux-gkeop - Linux kernel for Google Container Engine (GKE) systems
o linux-gkeop-5.4 - Linux kernel for Google Container Engine (GKE) systems
o linux-hwe-5.4 - Linux hardware enablement (HWE) kernel
o linux-kvm - Linux kernel for cloud environments
o linux-oracle - Linux kernel for Oracle Cloud systems
o linux-oracle-5.4 - Linux kernel for Oracle Cloud systems
o linux-raspi - Linux kernel for Raspberry Pi (V8) systems
o linux-raspi-5.4 - Linux kernel for Raspberry Pi (V8) systems
Details
Loris Reiff discovered that the BPF implementation in the Linux kernel did
not properly validate attributes in the getsockopt BPF hook. A local
attacker could possibly use this to cause a denial of service (system
crash). ( CVE-2021-20194 )
Olivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H. Schonherr
discovered that the Xen paravirtualization backend in the Linux kernel did
not properly propagate errors to frontend drivers in some situations. An
attacker in a guest VM could possibly use this to cause a denial of service
(host domain crash). ( CVE-2021-26930 )
Jan Beulich discovered that multiple Xen backends in the Linux kernel did
not properly handle certain error conditions under paravirtualization. An
attacker in a guest VM could possibly use this to cause a denial of service
(host domain crash). ( CVE-2021-26931 )
It was discovered that the network block device (nbd) driver in the Linux
kernel contained a use-after-free vulnerability during device setup. A
local attacker with access to the nbd device could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
( CVE-2021-3348 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o linux-image-5.4.0-1037-kvm - 5.4.0-1037.38
o linux-image-gkeop-5.4 - 5.4.0.1013.16
o linux-image-5.4.0-1043-aws - 5.4.0-1043.45
o linux-image-5.4.0-71-generic - 5.4.0-71.79
o linux-image-oem-osp1 - 5.4.0.71.74
o linux-image-oracle - 5.4.0.1042.39
o linux-image-azure - 5.4.0.1044.42
o linux-image-5.4.0-71-lowlatency - 5.4.0-71.79
o linux-image-gkeop - 5.4.0.1013.16
o linux-image-virtual - 5.4.0.71.74
o linux-image-5.4.0-1042-oracle - 5.4.0-1042.45
o linux-image-generic - 5.4.0.71.74
o linux-image-raspi - 5.4.0.1033.68
o linux-image-5.4.0-1013-gkeop - 5.4.0-1013.14
o linux-image-5.4.0-71-generic-lpae - 5.4.0-71.79
o linux-image-oem - 5.4.0.71.74
o linux-image-5.4.0-1041-gcp - 5.4.0-1041.44
o linux-image-aws - 5.4.0.1043.44
o linux-image-kvm - 5.4.0.1037.35
o linux-image-raspi2 - 5.4.0.1033.68
o linux-image-5.4.0-1033-raspi - 5.4.0-1033.36
o linux-image-generic-lpae - 5.4.0.71.74
o linux-image-gcp - 5.4.0.1041.50
o linux-image-5.4.0-1044-azure - 5.4.0-1044.46
o linux-image-lowlatency - 5.4.0.71.74
Ubuntu 18.04
o linux-image-gkeop-5.4 - 5.4.0.1013.14~18.04.14
o linux-image-5.4.0-1043-aws - 5.4.0-1043.45~18.04.1
o linux-image-5.4.0-1040-gke - 5.4.0-1040.42~18.04.1
o linux-image-5.4.0-71-generic - 5.4.0-71.79~18.04.1
o linux-image-oem-osp1 - 5.4.0.71.79~18.04.64
o linux-image-oracle - 5.4.0.1042.45~18.04.24
o linux-image-generic-hwe-18.04 - 5.4.0.71.79~18.04.64
o linux-image-azure - 5.4.0.1044.24
o linux-image-5.4.0-71-lowlatency - 5.4.0-71.79~18.04.1
o linux-image-snapdragon-hwe-18.04 - 5.4.0.71.79~18.04.64
o linux-image-generic-lpae-hwe-18.04 - 5.4.0.71.79~18.04.64
o linux-image-5.4.0-1042-oracle - 5.4.0-1042.45~18.04.1
o linux-image-5.4.0-1013-gkeop - 5.4.0-1013.14~18.04.1
o linux-image-lowlatency-hwe-18.04 - 5.4.0.71.79~18.04.64
o linux-image-5.4.0-71-generic-lpae - 5.4.0-71.79~18.04.1
o linux-image-virtual-hwe-18.04 - 5.4.0.71.79~18.04.64
o linux-image-gke-5.4 - 5.4.0.1040.42~18.04.7
o linux-image-oem - 5.4.0.71.79~18.04.64
o linux-image-5.4.0-1041-gcp - 5.4.0-1041.44~18.04.1
o linux-image-aws - 5.4.0.1043.26
o linux-image-5.4.0-1033-raspi - 5.4.0-1033.36~18.04.1
o linux-image-raspi-hwe-18.04 - 5.4.0.1033.35
o linux-image-gcp - 5.4.0.1041.28
o linux-image-5.4.0-1044-azure - 5.4.0-1044.46~18.04.1
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References
o CVE-2021-26930
o CVE-2021-20194
o CVE-2021-3348
o CVE-2021-26931
Related notices
o USN-4910-1 : linux-image-oracle, linux, linux-image-gke, linux-image-aws,
linux-image-5.8.0-49-generic, linux-image-5.8.0-49-generic-lpae,
linux-image-azure, linux-image-generic-hwe-20.04,
linux-image-5.8.0-1020-raspi, linux-image-gcp,
linux-image-5.8.0-1020-raspi-nolpae, linux-image-generic-64k-hwe-20.04,
linux-image-generic-lpae-hwe-20.04, linux-oracle,
linux-image-5.8.0-49-generic-64k, linux-image-generic-lpae, linux-hwe-5.8,
linux-image-5.8.0-49-lowlatency, linux-image-5.8.0-1025-oracle,
linux-image-generic-64k, linux-image-generic, linux-image-oem-20.04,
linux-image-raspi-nolpae, linux-raspi, linux-gcp, linux-image-raspi,
linux-aws, linux-image-virtual-hwe-20.04, linux-image-kvm,
linux-image-5.8.0-1028-aws, linux-image-lowlatency-hwe-20.04,
linux-image-5.8.0-1023-kvm, linux-azure, linux-image-lowlatency, linux-kvm,
linux-image-5.8.0-1027-gcp, linux-image-5.8.0-1027-azure,
linux-image-virtual
o USN-4907-1 : linux-image-powerpc-e500mc, linux-image-oracle,
linux-azure-4.15, linux, linux-image-azure-lts-18.04, linux-image-dell300x,
linux-image-aws-hwe, linux-image-gke, linux-image-4.15.0-141-lowlatency,
linux-gcp-4.15, linux-aws-hwe, linux-image-4.15.0-1016-dell300x,
linux-raspi2, linux-image-azure, linux-image-oracle-lts-18.04,
linux-image-gcp-lts-18.04, linux-image-4.15.0-141-generic-lpae,
linux-image-gcp, linux-image-aws-lts-18.04, linux-oracle,
linux-image-4.15.0-141-generic, linux-image-generic-lpae,
linux-image-powerpc-smp, linux-image-4.15.0-1069-oracle, linux-dell300x,
linux-image-4.15.0-1083-raspi2, linux-image-generic,
linux-image-snapdragon, linux-image-4.15.0-1089-kvm, linux-gcp, linux-aws,
linux-image-kvm, linux-image-4.15.0-1112-azure, linux-azure,
linux-image-raspi2, linux-snapdragon, linux-image-4.15.0-1098-aws,
linux-image-lowlatency, linux-kvm, linux-image-powerpc64-smp,
linux-image-powerpc64-emb, linux-image-virtual,
linux-image-4.15.0-1097-gcp, linux-image-4.15.0-1100-snapdragon
o USN-4884-1 : linux-oem-5.10, linux-image-5.10.0-1017-oem,
linux-image-oem-20.04b
o USN-4879-1 : linux-image-oracle, linux, linux-image-gke,
linux-image-5.8.0-45-lowlatency, linux-image-5.8.0-1025-aws,
linux-image-aws, linux-image-azure, linux-image-generic-hwe-20.04,
linux-image-5.8.0-45-generic-lpae, linux-image-gcp,
linux-image-generic-64k-hwe-20.04, linux-image-generic-lpae-hwe-20.04,
linux-image-5.8.0-1017-raspi, linux-oracle, linux-image-generic-lpae,
linux-hwe-5.8, linux-image-5.8.0-1024-azure, linux-image-oem-20.04,
linux-image-generic-64k, linux-image-generic, linux-image-raspi-nolpae,
linux-image-5.8.0-45-generic, linux-raspi, linux-gcp, linux-image-raspi,
linux-aws, linux-image-virtual-hwe-20.04, linux-image-5.8.0-1020-kvm,
linux-image-5.8.0-1022-oracle, linux-image-kvm,
linux-image-5.8.0-45-generic-64k, linux-image-lowlatency-hwe-20.04,
linux-azure, linux-image-5.8.0-1017-raspi-nolpae, linux-image-lowlatency,
linux-kvm, linux-image-5.8.0-1024-gcp, linux-image-virtual
o USN-4904-1 : linux-image-virtual, linux-image-powerpc-e500mc, linux,
linux-image-generic-lpae-lts-xenial, linux-image-aws,
linux-image-lowlatency-lts-xenial, linux-image-virtual-lts-xenial,
linux-raspi2, linux-image-4.4.0-1154-snapdragon,
linux-image-4.4.0-208-powerpc-smp, linux-image-4.4.0-208-powerpc-e500mc,
linux-image-4.4.0-1126-aws, linux-image-4.4.0-1091-kvm,
linux-image-4.4.0-1090-aws, linux-image-generic-lpae,
linux-image-powerpc-smp, linux-image-4.4.0-208-powerpc64-smp,
linux-image-snapdragon, linux-image-generic, linux-lts-xenial, linux-aws,
linux-image-generic-lts-xenial, linux-image-kvm,
linux-image-4.4.0-208-generic, linux-image-4.4.0-1150-raspi2,
linux-image-raspi2, linux-snapdragon, linux-image-lowlatency, linux-kvm,
linux-image-4.4.0-208-generic-lpae, linux-image-powerpc64-smp,
linux-image-4.4.0-208-powerpc64-emb, linux-image-powerpc64-emb,
linux-image-4.4.0-208-lowlatency
- --------------------------------------------------------------------------------
USN-4910-1: Linux kernel vulnerabilities
13 April 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-hwe-5.8 - Linux hardware enablement (HWE) kernel
o linux-kvm - Linux kernel for cloud environments
o linux-oracle - Linux kernel for Oracle Cloud systems
o linux-raspi - Linux kernel for Raspberry Pi (V8) systems
Details
Ryota Shiga discovered that the sockopt BPF hooks in the Linux kernel could
allow a user space program to probe for valid kernel addresses. A local
attacker could use this to ease exploitation of another kernel
vulnerability. ( CVE-2021-20239 )
It was discovered that the BPF verifier in the Linux kernel did not
properly handle signed add32 and sub integer overflows. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. ( CVE-2021-20268 )
It was discovered that the priority inheritance futex implementation in the
Linux kernel contained a race condition, leading to a use-after-free
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. ( CVE-2021-3347 )
It was discovered that the network block device (nbd) driver in the Linux
kernel contained a use-after-free vulnerability during device setup. A
local attacker with access to the nbd device could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
( CVE-2021-3348 )
discovered that the NFS implementation in the Linux kernel did not
properly prevent access outside of an NFS export that is a subdirectory of
a file system. An attacker could possibly use this to bypass NFS access
restrictions. ( CVE-2021-3178 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o linux-image-5.8.0-1020-raspi - 5.8.0-1020.23
o linux-image-5.8.0-1020-raspi-nolpae - 5.8.0-1020.23
o linux-image-5.8.0-49-generic-lpae - 5.8.0-49.55
o linux-image-oracle - 5.8.0.1025.24
o linux-image-5.8.0-49-generic-64k - 5.8.0-49.55
o linux-image-raspi-nolpae - 5.8.0.1020.23
o linux-image-5.8.0-1023-kvm - 5.8.0-1023.25
o linux-image-5.8.0-1027-gcp - 5.8.0-1027.28
o linux-image-oem-20.04 - 5.8.0.49.54
o linux-image-azure - 5.8.0.1027.27
o linux-image-5.8.0-1025-oracle - 5.8.0-1025.26
o linux-image-virtual - 5.8.0.49.54
o linux-image-raspi - 5.8.0.1020.23
o linux-image-gke - 5.8.0.1027.27
o linux-image-generic-64k - 5.8.0.49.54
o linux-image-generic - 5.8.0.49.54
o linux-image-aws - 5.8.0.1028.30
o linux-image-kvm - 5.8.0.1023.25
o linux-image-5.8.0-1027-azure - 5.8.0-1027.29
o linux-image-5.8.0-49-lowlatency - 5.8.0-49.55
o linux-image-5.8.0-1028-aws - 5.8.0-1028.30
o linux-image-5.8.0-49-generic - 5.8.0-49.55
o linux-image-generic-lpae - 5.8.0.49.54
o linux-image-gcp - 5.8.0.1027.27
o linux-image-lowlatency - 5.8.0.49.54
Ubuntu 20.04
o linux-image-virtual-hwe-20.04 - 5.8.0.49.55~20.04.33
o linux-image-5.8.0-49-lowlatency - 5.8.0-49.55~20.04.1
o linux-image-generic-lpae-hwe-20.04 - 5.8.0.49.55~20.04.33
o linux-image-5.8.0-49-generic - 5.8.0-49.55~20.04.1
o linux-image-generic-64k-hwe-20.04 - 5.8.0.49.55~20.04.33
o linux-image-lowlatency-hwe-20.04 - 5.8.0.49.55~20.04.33
o linux-image-5.8.0-49-generic-lpae - 5.8.0-49.55~20.04.1
o linux-image-generic-hwe-20.04 - 5.8.0.49.55~20.04.33
o linux-image-5.8.0-49-generic-64k - 5.8.0-49.55~20.04.1
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References
o CVE-2021-20268
o CVE-2021-3178
o CVE-2021-3347
o CVE-2021-3348
o CVE-2021-20239
Related notices
o USN-4877-1 : linux-aws-hwe, linux-image-4.15.0-137-lowlatency,
linux-image-4.15.0-1094-gcp, linux-image-azure, linux-image-powerpc-e500mc,
linux-image-4.15.0-1095-aws, linux-image-dell300x,
linux-image-azure-lts-18.04, linux-image-lowlatency, linux-raspi2,
linux-aws, linux-image-4.15.0-137-generic, linux-dell300x,
linux-image-generic-lpae, linux-gcp, linux-image-gcp,
linux-image-4.15.0-1066-oracle, linux-image-gke, linux-gcp-4.15,
linux-image-4.15.0-1086-kvm, linux-image-raspi2, linux-image-powerpc-smp,
linux-image-lowlatency-hwe-16.04, linux-snapdragon,
linux-image-4.15.0-1013-dell300x, linux-image-powerpc64-emb,
linux-image-powerpc64-smp, linux-image-snapdragon,
linux-image-4.15.0-1097-snapdragon, linux-kvm, linux-image-oracle,
linux-image-gcp-lts-18.04, linux-image-kvm, linux-image-4.15.0-1080-raspi2,
linux-image-oracle-lts-18.04, linux-image-4.15.0-1109-azure,
linux-image-generic-hwe-16.04, linux, linux-image-4.15.0-137-generic-lpae,
linux-azure, linux-oracle, linux-image-virtual,
linux-image-generic-lpae-hwe-16.04, linux-image-virtual-hwe-16.04,
linux-image-oem, linux-image-generic, linux-image-aws-hwe, linux-hwe,
linux-image-aws-lts-18.04, linux-azure-4.15
o USN-4907-1 : linux-aws-hwe, linux-image-4.15.0-1112-azure,
linux-image-azure, linux-image-4.15.0-1083-raspi2,
linux-image-powerpc-e500mc, linux-image-4.15.0-1016-dell300x,
linux-image-4.15.0-141-generic, linux-image-dell300x,
linux-image-azure-lts-18.04, linux-image-lowlatency, linux-raspi2,
linux-aws, linux-image-4.15.0-1100-snapdragon, linux-dell300x,
linux-image-generic-lpae, linux-gcp, linux-image-4.15.0-1089-kvm,
linux-image-gcp, linux-image-gke, linux-gcp-4.15, linux-image-raspi2,
linux-image-4.15.0-141-generic-lpae, linux-image-powerpc-smp,
linux-image-4.15.0-141-lowlatency, linux-snapdragon,
linux-image-4.15.0-1097-gcp, linux-image-4.15.0-1069-oracle,
linux-image-powerpc64-emb, linux-image-powerpc64-smp,
linux-image-snapdragon, linux-kvm, linux-image-oracle,
linux-image-gcp-lts-18.04, linux-image-kvm, linux-image-oracle-lts-18.04,
linux, linux-azure, linux-oracle, linux-image-virtual, linux-image-generic,
linux-image-aws-hwe, linux-image-4.15.0-1098-aws,
linux-image-aws-lts-18.04, linux-azure-4.15
o USN-4878-1 : linux-image-5.4.0-67-lowlatency, linux-image-aws,
linux-image-azure, linux-image-gcp-edge, linux-image-5.4.0-1011-gkeop,
linux-image-oem-osp1, linux-image-raspi, linux-image-snapdragon-hwe-18.04,
linux-image-lowlatency, linux-image-generic-hwe-18.04, linux-aws,
linux-gkeop-5.4, linux-image-raspi-hwe-18.04, linux-image-aws-edge,
linux-image-azure-edge, linux-image-gkeop-5.4, linux-image-generic-lpae,
linux-gcp, linux-image-gcp, linux-image-gkeop, linux-image-5.4.0-1038-gcp,
linux-image-lowlatency-hwe-18.04, linux-image-raspi2,
linux-image-5.4.0-1030-raspi, linux-aws-5.4, linux-gke-5.4,
linux-raspi-5.4, linux-image-gke-5.4, linux-image-5.4.0-1041-azure,
linux-azure-5.4, linux-image-oracle, linux-kvm,
linux-image-5.4.0-67-generic, linux-image-5.4.0-1037-gke, linux-image-kvm,
linux-image-5.4.0-67-generic-lpae, linux, linux-image-5.4.0-1039-oracle,
linux-azure, linux-gcp-5.4, linux-oracle, linux-oracle-5.4,
linux-image-virtual, linux-image-5.4.0-1039-aws, linux-image-oem,
linux-image-generic, linux-image-virtual-hwe-18.04,
linux-image-5.4.0-1034-kvm, linux-gkeop, linux-hwe-5.4,
linux-image-generic-lpae-hwe-18.04, linux-raspi
o USN-4909-1 : linux-image-aws, linux-image-azure,
linux-image-5.4.0-1044-azure, linux-image-oem-osp1, linux-image-raspi,
linux-image-snapdragon-hwe-18.04, linux-image-lowlatency,
linux-image-generic-hwe-18.04, linux-aws, linux-gkeop-5.4,
linux-image-raspi-hwe-18.04, linux-image-5.4.0-71-lowlatency,
linux-image-gkeop-5.4, linux-image-generic-lpae, linux-gcp,
linux-image-5.4.0-71-generic-lpae, linux-image-gcp, linux-image-gkeop,
linux-image-lowlatency-hwe-18.04, linux-image-raspi2, linux-aws-5.4,
linux-gke-5.4, linux-image-5.4.0-1040-gke, linux-raspi-5.4,
linux-image-5.4.0-1037-kvm, linux-image-gke-5.4, linux-azure-5.4,
linux-image-oracle, linux-kvm, linux-image-kvm, linux-image-5.4.0-1043-aws,
linux, linux-azure, linux-gcp-5.4, linux-gkeop, linux-image-5.4.0-1041-gcp,
linux-oracle, linux-oracle-5.4, linux-image-virtual,
linux-image-5.4.0-71-generic, linux-image-oem, linux-image-generic,
linux-image-5.4.0-1033-raspi, linux-image-virtual-hwe-18.04,
linux-image-5.4.0-1013-gkeop, linux-image-5.4.0-1042-oracle, linux-hwe-5.4,
linux-image-generic-lpae-hwe-18.04, linux-raspi
o USN-4884-1 : linux-image-5.10.0-1017-oem, linux-image-oem-20.04b,
linux-oem-5.10
o USN-4876-1 : linux-image-powerpc64-smp-lts-xenial, linux-image-aws,
linux-image-4.4.0-204-powerpc64-smp, linux-image-powerpc-e500mc,
linux-image-4.4.0-204-generic, linux-image-lowlatency, linux-raspi2,
linux-aws, linux-image-4.4.0-204-generic-lpae,
linux-image-4.4.0-204-powerpc-e500mc, linux-image-generic-lpae,
linux-image-4.4.0-204-powerpc64-emb, linux-image-powerpc64-emb-lts-xenial,
linux-image-lowlatency-lts-xenial, linux-image-4.4.0-204-powerpc-smp,
linux-image-raspi2, linux-image-powerpc-smp,
linux-image-powerpc-smp-lts-xenial, linux-snapdragon,
linux-image-generic-lpae-lts-xenial, linux-image-powerpc64-emb,
linux-image-powerpc64-smp, linux-image-snapdragon,
linux-image-4.4.0-1089-kvm, linux-kvm, linux-image-kvm,
linux-image-virtual-lts-xenial, linux, linux-image-4.4.0-1087-aws,
linux-image-generic-lts-xenial, linux-image-virtual,
linux-image-4.4.0-1147-raspi2, linux-image-powerpc-e500mc-lts-xenial,
linux-image-4.4.0-1151-snapdragon, linux-image-generic, linux-lts-xenial,
linux-image-4.4.0-204-lowlatency, linux-image-4.4.0-1123-aws
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