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AUSCERT External Security Bulletin Redistribution
ESB-2020.3010
USN-4484-1: Linux kernel vulnerability
2 September 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Existing Account
Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-14356
Reference: ESB-2020.3008
Original Bulletin:
https://usn.ubuntu.com/4484-1/
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USN-4484-1: Linux kernel vulnerability
02 September 2020
The system could be made to crash or run programs as an administrator.
Releases
o Ubuntu 18.04 LTS
Packages
o linux-aws-5.3 - Linux kernel for Amazon Web Services (AWS) systems
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
It was discovered that the cgroup v2 subsystem in the Linux kernel did not
properly perform reference counting in some situations, leading to a NULL
pointer dereference. A local attacker could use this to cause a denial of
service or possibly gain administrative privileges. (CVE-2020-14356)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o linux-image-5.3.0-1032-raspi2 - 5.3.0-1032.34
o linux-image-5.3.0-1034-aws - 5.3.0-1034.36
o linux-image-5.3.0-1034-gke - 5.3.0-1034.36
o linux-image-5.3.0-66-generic - 5.3.0-66.60
o linux-image-5.3.0-66-lowlatency - 5.3.0-66.60
o linux-image-aws - 5.3.0.1034.33
o linux-image-gke-5.3 - 5.3.0.1034.19
o linux-image-gkeop-5.3 - 5.3.0.66.123
o linux-image-raspi2-hwe-18.04 - 5.3.0.1032.22
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-2020-14356
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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
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
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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
not be updated when updates to the original are made. If downloading at
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Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
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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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The post ESB-2020.3010 - [Ubuntu] kernel: Multiple vulnerabilities first appeared on Malware Devil.
https://malwaredevil.com/2020/09/02/esb-2020-3010-ubuntu-kernel-multiple-vulnerabilities/?utm_source=rss&utm_medium=rss&utm_campaign=esb-2020-3010-ubuntu-kernel-multiple-vulnerabilities
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