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AUSCERT External Security Bulletin Redistribution
ESB-2021.2219
USN-5002-1: Linux kernel (HWE) vulnerability
24 June 2021
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AusCERT Security Bulletin Summary
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Product: linux kernel (HWE)
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands — Existing Account
Increased Privileges — Existing Account
Denial of Service — Existing Account
Access Confidential Data — Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3609
Reference: ESB-2021.2216
Original Bulletin:
https://ubuntu.com/security/notices/USN-5002-1
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USN-5002-1: Linux kernel (HWE) vulnerability
23 June 2021
The system could be made to run programs as an administrator.
Releases
o Ubuntu 18.04 LTS
Packages
o linux-gke-5.3 – Linux kernel for Google Container Engine (GKE) systems
o linux-hwe – Linux hardware enablement (HWE) kernel
o linux-raspi2-5.3 – Linux kernel for Raspberry Pi (V8) systems
Details
Norbert Slusarek discovered a race condition in the CAN BCM networking
protocol of the Linux kernel leading to multiple use-after-free
vulnerabilities. A local attacker could use this issue to execute arbitrary
code.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o linux-image-gkeop-5.3 – 5.3.0.75.132
o linux-image-gke-5.3 – 5.3.0.1044.27
o linux-image-5.3.0-1044-gke – 5.3.0-1044.47
o linux-image-5.3.0-1041-raspi2 – 5.3.0-1041.43
o linux-image-5.3.0-75-lowlatency – 5.3.0-75.71
o linux-image-5.3.0-75-generic – 5.3.0-75.71
o linux-image-raspi2-hwe-18.04 – 5.3.0.1041.30
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-2021-3609
Related notices
o USN-4997-1 : linux-image-virtual, linux-image-generic-64k-hwe-20.04,
linux-image-generic-64k-hwe-20.04-edge, linux-image-virtual-hwe-20.04-edge,
linux-image-oracle, linux-image-lowlatency-hwe-20.04-edge, linux-image-gcp,
linux-image-generic-lpae, linux-image-generic-lpae-hwe-20.04,
linux-image-5.11.0-1012-raspi, linux-image-lowlatency,
linux-image-generic-64k, linux-raspi, linux-image-5.11.0-1011-gcp,
linux-image-generic-hwe-20.04-edge, linux-image-5.11.0-1012-raspi-nolpae,
linux-image-raspi, linux-image-5.11.0-22-generic-lpae, linux,
linux-image-5.11.0-1009-azure, linux-image-generic,
linux-image-generic-hwe-20.04, linux-image-oem-20.04,
linux-image-5.11.0-1010-oracle, linux-image-azure, linux-aws,
linux-image-raspi-nolpae, linux-image-5.11.0-1011-aws,
linux-image-5.11.0-22-generic-64k, linux-image-virtual-hwe-20.04,
linux-image-gke, linux-image-aws, linux-image-5.11.0-22-generic,
linux-image-lowlatency-hwe-20.04, linux-image-5.11.0-22-lowlatency,
linux-azure, linux-oracle, linux-image-generic-lpae-hwe-20.04-edge,
linux-gcp
o USN-4999-1 : linux-image-5.8.0-59-lowlatency,
linux-image-5.8.0-59-generic-lpae, linux-image-5.8.0-59-generic-64k,
linux-image-virtual, linux-image-generic-64k-hwe-20.04,
linux-image-azure-edge, linux-image-generic-64k-hwe-20.04-edge,
linux-image-virtual-hwe-20.04-edge, linux-hwe-5.8, linux-image-oracle,
linux-image-lowlatency-hwe-20.04-edge, linux-image-gcp,
linux-image-generic-lpae, linux-image-generic-lpae-hwe-20.04,
linux-image-lowlatency, linux-image-5.8.0-1033-oracle, linux-oracle-5.8,
linux-image-generic-64k, linux-raspi, linux-image-generic-hwe-20.04-edge,
linux-image-gcp-edge, linux-image-raspi, linux-image-5.8.0-1036-azure,
linux-image-oracle-edge, linux, linux-image-generic,
linux-image-generic-hwe-20.04, linux-image-oem-20.04, linux-image-azure,
linux-image-5.8.0-1029-raspi, linux-aws, linux-image-kvm, linux-aws-5.8,
linux-image-raspi-nolpae, linux-image-virtual-hwe-20.04, linux-image-gke,
linux-image-5.8.0-1038-aws, linux-image-5.8.0-1030-kvm, linux-image-aws,
linux-image-5.8.0-1029-raspi-nolpae, linux-image-5.8.0-1035-gcp,
linux-image-lowlatency-hwe-20.04, linux-azure, linux-gcp-5.8, linux-kvm,
linux-oracle, linux-image-generic-lpae-hwe-20.04-edge, linux-azure-5.8,
linux-gcp, linux-image-5.8.0-59-generic
o USN-5000-1 : linux-image-lowlatency-hwe-18.04, linux-image-oem-osp1,
linux-image-virtual-hwe-18.04, linux-image-virtual, linux-image-azure-edge,
linux-gkeop-5.4, linux-image-raspi2-hwe-18.04-edge, linux-azure-5.4,
linux-image-5.4.0-1018-gkeop, linux-image-5.4.0-1038-raspi,
linux-image-oracle, linux-image-gkeop,
linux-image-snapdragon-hwe-18.04-edge, linux-image-5.4.0-77-generic,
linux-image-gcp, linux-image-aws-edge, linux-image-generic-hwe-18.04-edge,
linux-image-generic-lpae, linux-image-raspi-hwe-18.04-edge,
linux-image-raspi2-hwe-18.04, linux-image-generic-lpae-hwe-18.04-edge,
linux-image-5.4.0-1046-gke, linux-image-lowlatency, linux-gke-5.4,
linux-image-gkeop-5.4, linux-image-raspi-hwe-18.04, linux-oracle-5.4,
linux-image-5.4.0-1051-azure, linux-raspi, linux-image-gcp-lts-20.04,
linux-image-generic-hwe-18.04, linux-image-gcp-edge, linux-image-raspi,
linux-image-azure-lts-20.04, linux-image-aws-lts-20.04, linux-gke,
linux-image-5.4.0-1046-gcp, linux-image-5.4.0-77-generic-lpae,
linux-image-oracle-edge, linux, linux-image-generic,
linux-image-lowlatency-hwe-18.04-edge, linux-oracle, linux-image-azure,
linux-gkeop, linux-image-oem, linux-image-generic-lpae-hwe-18.04,
linux-aws, linux-image-oracle-lts-20.04, linux-image-5.4.0-1048-oracle,
linux-image-gke, linux-image-aws, linux-image-gke-5.4, linux-image-raspi2,
linux-aws-5.4, linux-image-snapdragon-hwe-18.04, linux-azure,
linux-raspi-5.4, linux-image-virtual-hwe-18.04-edge, linux-hwe-5.4,
linux-gcp-5.4, linux-image-5.4.0-1051-aws, linux-gcp,
linux-image-5.4.0-77-lowlatency
o USN-5001-1 : linux-oem-5.10, linux-image-5.10.0-1033-oem,
linux-image-oem-20.04, linux-image-oem-20.04b, linux-image-oem-20.04-edge
o USN-5003-1 : linux-image-4.15.0-147-generic,
linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-1103-gcp,
linux-image-4.15.0-1075-oracle, linux-image-virtual,
linux-image-azure-edge, linux-raspi2, linux-image-snapdragon,
linux-image-generic-hwe-16.04-edge, linux-image-oracle, linux-image-gcp,
linux-image-virtual-hwe-16.04, linux-image-generic-lpae,
linux-image-4.15.0-147-lowlatency, linux-hwe, linux-image-dell300x,
linux-image-lowlatency, linux-image-4.15.0-147-generic-lpae,
linux-image-4.15.0-1022-dell300x, linux-image-oracle-lts-18.04,
linux-snapdragon, linux-image-aws-hwe, linux, linux-image-generic,
linux-image-4.15.0-1106-aws, linux-image-azure-lts-18.04,
linux-image-azure, linux-aws-hwe, linux-image-lowlatency-hwe-16.04,
linux-image-oem, linux-image-generic-lpae-hwe-16.04-edge, linux-aws,
linux-gcp-4.15, linux-image-generic-lpae-hwe-16.04, linux-image-gke,
linux-image-4.15.0-1106-snapdragon, linux-image-gcp-lts-18.04,
linux-image-raspi2, linux-image-4.15.0-1118-azure, linux-azure,
linux-image-4.15.0-1089-raspi2, linux-dell300x,
linux-image-generic-hwe-16.04, linux-image-virtual-hwe-16.04-edge,
linux-oracle, linux-azure-4.15, linux-gcp, linux-image-aws-lts-18.04
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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT’s members. As
AusCERT did not write the document quoted above, AusCERT has had no control
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contained in this security bulletin is the responsibility of each user or
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which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
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Previous advisories and external security bulletins can be retrieved from:
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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