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Ubuntu 20.04 LTS USN-5217-1 Critical: Linux Kernel Out-of-Bounds Write

ubuntu
Calendar Grey January 11, 2022
Dist Ubuntu Esm H88
Keep updated on essential Ubuntu security concerning Linux kernel patches and concerns, including resolutions and weaknesses.
Several security issues were fixed in the Linux kernel.

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)

Topics%20covered

Topics Covered

security advisory denial of service arbitrary code ubuntu linux kernel out-of-bounds write

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://bugs.launchpad.net/ubuntu/+source/linux/+bug/1956585

Severity
critical
Lowest
Low
Medium
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Critical

January 11, 2022

Topics%20covered

Topics Covered

security advisory denial of service arbitrary code ubuntu linux kernel out-of-bounds write

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.14/5.14.0-1018.19

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