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Ubuntu 20.04 LTS: USN-5294-1 Critical Kernel Security Advisory

ubuntu
Calendar Grey February 17, 2022
Dist Ubuntu Esm H88
Immediate action is required to address multiple severe vulnerabilities within Ubuntu's Linux kernel to prevent system failures and possible security breaches.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

Details:

It was discovered that the Packet network protocol implementation in the

Linux kernel contained a double-free vulnerability. A local attacker could

use this to cause a denial of service (system crash) or possibly execute

arbitrary code. (CVE-2021-22600)

Szymon Heidrich discovered that the USB Gadget subsystem in the Linux

kernel did not properly restrict the size of control requests for certain

gadget types, leading to possible out of bounds reads or writes. A local

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

possibly execute arbitrary code. (CVE-2021-39685)

Jann Horn discovered a race condition in the Unix domain socket

implementation in the Linux kernel that could result in a read-after-free.

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

or possibly execute arbitrary code. (CVE-2021-4083)

Kirill Tkhai discovere...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service code execution Ubuntu kernel

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.4.0-100-generic   5.4.0-100.113
  linux-image-5.4.0-100-generic-lpae  5.4.0-100.113
  linux-image-5.4.0-100-lowlatency  5.4.0-100.113
  linux-image-generic             5.4.0.100.104
  linux-image-generic-lpae        5.4.0.100.104
  linux-image-lowlatency          5.4.0.100.104
  linux-image-oem                 5.4.0.100.104
  linux-image-oem-osp1            5.4.0.100.104
  linux-image-virtual             5.4.0.100.104

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-5294-1

CVE-2021-22600, CVE-2021-39685, CVE-2021-4083, CVE-2021-4155,

CVE-2021-4202, CVE-2021-43975, CVE-2022-0330, CVE-2022-22942

Severity
critical
Lowest
Low
Medium
High
Critical

February 18, 2022

Topics%20covered

Topics Covered

security advisory denial of service code execution Ubuntu kernel

Package Information

https://launchpad.net/ubuntu/+source/linux/5.4.0-100.113

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