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Ubuntu 20.04 LTS USN-5218-1 Critical: Linux Kernel Security Issues

ubuntu
Calendar Grey January 11, 2022
Dist Ubuntu Esm H88
Ubuntu 20.04 LTS, powered by the Linux kernel, faces security risks like unpatched flaws and outdated software. Regular updates via APT and USN alerts are essential.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-oem-5.13: Linux kernel for OEM systems

Details:

Nadav Amit discovered that the hugetlb implementation in the Linux kernel

did not perform TLB flushes under certain conditions. A local attacker

could use this to leak or alter data from other processes that use huge

pages. (CVE-2021-4002)

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)

It was discovered that a race condition existed in the overlay file system

implementation in the Linux kernel. A local attacker could use this to

cause a denial of service (system crash). (CVE-2021-20321)

It was discovered that the NFC subsystem in the Linux kernel contained a

use-after-free vulnerability in its NFC Controller Interfa...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service remote code execution system update ubuntu linux kernel oem systems

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
  linux-image-5.13.0-1026-oem     5.13.0-1026.32
  linux-image-oem-20.04c          5.13.0.1026.29

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-5218-1

CVE-2021-20321, CVE-2021-3760, CVE-2021-4002, CVE-2021-41864,

CVE-2021-43056, CVE-2021-43267, CVE-2021-43389,

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

Severity
critical
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Critical

January 11, 2022

Topics%20covered

Topics Covered

security advisory denial of service remote code execution system update ubuntu linux kernel oem systems

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.13/5.13.0-1026.32

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