Ubuntu Security Notice USN-5217-1
January 11, 2022
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
Several security issues were fixed in the Linux kernel.
- linux-oem-5.14: Linux kernel for OEM systems
It was discovered that the NFS server implementation in the
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
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)
The problem can be corrected by updating your system to the
Ubuntu 20.04 LTS:
After a standard system update you need to reboot your computer
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates
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.