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Ubuntu 20.04 LTS USN-5207-1: Critical Kernel Issues Fixed

ubuntu
Calendar Grey January 5, 2022
Dist Ubuntu Esm H88
Strengthen Ubuntu 20.04 LTS by addressing Linux kernel vulnerabilities with the latest patches, enhancing system defenses against potential threats and data risk
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-oem-5.10: 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

contained a race condition around read-only maps. A privileged attacker

could use this to modify read-only maps. (CVE-2021-4001)

Luo Likang discovered that the FireDTV Firewire driver in the Linux kernel

did not properly perform bounds checking in some situations. A local

attacker could use this to cause a denial of service (system crash) or

possibly execute arbitrary code. (CVE-2021-42739)

It was discovered that the TIPC Protocol implementation in the Linux kernel

did not properly validate MSG_CRYPTO messages in some situations. An

attacker c...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service data protection critical kernel ubuntu oem

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.10.0-1053-oem     5.10.0-1053.55
  linux-image-oem-20.04           5.10.0.1053.55
  linux-image-oem-20.04b          5.10.0.1053.55

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-5207-1

CVE-2021-4001, CVE-2021-4002, CVE-2021-42739, CVE-2021-43267

Severity
critical
Lowest
Low
Medium
High
Critical

January 05, 2022

Topics%20covered

Topics Covered

security advisory denial of service data protection critical kernel ubuntu oem

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.10/5.10.0-1053.55

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