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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
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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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