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AUSCERT External Security Bulletin Redistribution
USN-4484-1: Linux kernel vulnerability
2 September 2020
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Denial of Service -- Existing Account
Root Compromise -- Existing Account
CVE Names: CVE-2020-14356
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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.
o Ubuntu 18.04 LTS
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
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)
The problem can be corrected by updating your system to the following package
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 - 22.214.171.1244.33
o linux-image-gke-5.3 - 126.96.36.1994.19
o linux-image-gkeop-5.3 - 188.8.131.52.123
o linux-image-raspi2-hwe-18.04 - 184.108.40.2062.22
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.
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