Ubuntu Security Notice USN-5217-1
January 11, 2022
linux-oem-5.14 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 20.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- linux-oem-5.14: Linux kernel for OEM systems
Details:
It was discovered that the NFS server implementation in the
Linux kernel
contained an out-of-bounds write vulnerability. A local attacker
could use
this to cause a denial of service (system crash) or possibly
execute
arbitrary code. (CVE-2021-4090)
It was discovered that the eBPF implementation in the Linux
kernel did
not properly validate the memory size of certain ring buffer
operation
arguments. A local attacker could use this to cause a denial of
service
(system crash) or possibly execute arbitrary code. (LP:
#1956585)
Update instructions:
The problem can be corrected by updating your system to the
following
package versions:
Ubuntu 20.04 LTS:
linux-image-5.14.0-1018-oem 5.14.0-1018.19
linux-image-oem-20.04d 5.14.0.1018.16
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:
https://ubuntu.com/security/notices/USN-5217-1
CVE-2021-4090, https://launchpad.net/bugs/1956585
Package Information:
https://launchpad.net/ubuntu/+source/linux-oem-5.14/5.14.0-1018.19
Read more https://packetstormsecurity.com/files/165510/USN-5217-1.txt