1. Ubuntu Security Notices
  2. USN-5814-1

USN-5814-1: Linux kernel vulnerabilities

Publication date

19 January 2023

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

Kyle Zeng discovered that the sysctl implementation in the Linux kernel
contained a stack-based buffer overflow. A local attacker could use this to
cause a denial of service (system crash) or execute arbitrary code.
(CVE-2022-4378)

Tamás Koczka discovered that the Bluetooth L2CAP handshake implementation
in the Linux kernel contained multiple use-after-free vulnerabilities. A
physically proximate attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2022-42896)

It was discovered that the Xen netback driver in the Linux kernel did not
properly handle packets structured in certain ways. An attacker in a guest
VM could possibly use this to cause a denial of service (host NIC
availability). (CVE-2022-3643)

It was discovered that an integer overflow...

Kyle Zeng discovered that the sysctl implementation in the Linux kernel
contained a stack-based buffer overflow. A local attacker could use this to
cause a denial of service (system crash) or execute arbitrary code.
(CVE-2022-4378)

Tamás Koczka discovered that the Bluetooth L2CAP handshake implementation
in the Linux kernel contained multiple use-after-free vulnerabilities. A
physically proximate attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2022-42896)

It was discovered that the Xen netback driver in the Linux kernel did not
properly handle packets structured in certain ways. An attacker in a guest
VM could possibly use this to cause a denial of service (host NIC
availability). (CVE-2022-3643)

It was discovered that an integer overflow vulnerability existed in the
Bluetooth subsystem in the Linux kernel. A physically proximate attacker
could use this to cause a denial of service (system crash).
(CVE-2022-45934)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
22.10 kinetic linux-image-lowlatency-64k –  5.19.0.1015.12
linux-image-5.19.0-1017-azure –  5.19.0-1017.18
linux-image-azure –  5.19.0.1017.13
linux-image-5.19.0-1015-lowlatency –  5.19.0-1015.16
linux-image-5.19.0-1015-lowlatency-64k –  5.19.0-1015.16
linux-image-lowlatency –  5.19.0.1015.12
22.04 jammy linux-image-5.15.0-1023-intel-iotg –  5.15.0-1023.28
linux-image-gkeop –  5.15.0.1013.12
linux-image-lowlatency-hwe-22.04 –  5.15.0.58.51
linux-image-5.15.0-1013-gkeop –  5.15.0-1013.17
linux-image-lowlatency-64k –  5.15.0.58.51
linux-image-intel-iotg –  5.15.0.1023.22
linux-image-5.15.0-58-lowlatency-64k –  5.15.0-58.64
linux-image-lowlatency-64k-hwe-22.04 –  5.15.0.58.51
linux-image-5.15.0-58-lowlatency –  5.15.0-58.64
linux-image-gkeop-5.15 –  5.15.0.1013.12
linux-image-lowlatency –  5.15.0.58.51
20.04 focal linux-image-oracle –  5.15.0.1027.33~20.04.1
linux-image-5.15.0-58-lowlatency –  5.15.0-58.64~20.04.1
linux-image-5.15.0-58-lowlatency-64k –  5.15.0-58.64~20.04.1
linux-image-lowlatency-64k-hwe-20.04 –  5.15.0.58.64~20.04.21
linux-image-lowlatency-hwe-20.04 –  5.15.0.58.64~20.04.21
linux-image-5.15.0-1027-oracle –  5.15.0-1027.33~20.04.1

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›