Ubuntu 22.04 LTS: USN-5779-1 Moderate: Kernel Exploits Overview

ubuntu

December 14, 2022

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

- linux-azure-fde: Linux kernel for Microsoft Azure CVM cloud systems

- linux-azure-5.15: Linux kernel for Microsoft Azure cloud systems

Details:

It was discovered that the NFSD implementation in the Linux kernel did not

properly handle some RPC messages, leading to a buffer overflow. A remote

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

possibly execute arbitrary code. (CVE-2022-43945)

Jann Horn discovered that the Linux kernel did not properly track memory

allocations for anonymous VMA mappings in some situations, leading to

potential data structure reuse. A local attacker could use this to cause a

denial of service (system crash) or possibly execute arbitrary code.

(CVE-2022-42703)

It was discovered that a memory leak existed in the IPv6 implementation of

the Linux kernel. A local attacker...

Read the Full Advisory

Topics Covered

security advisory denial of service buffer overflow remote attack Ubuntu local attack kernel exploit

Update Instructions

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

Ubuntu 22.04 LTS:
   linux-image-5.15.0-1029-azure   5.15.0-1029.36
   linux-image-5.15.0-1029-azure-fde  5.15.0-1029.36.1
   linux-image-azure               5.15.0.1029.25
   linux-image-azure-fde           5.15.0.1029.36.6
   linux-image-azure-lts-22.04     5.15.0.1029.25

Ubuntu 20.04 LTS:
   linux-image-5.15.0-1029-azure   5.15.0-1029.36~20.04.1
   linux-image-azure               5.15.0.1029.36~20.04.19

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.