Ubuntu 22.04 LTS USN-5792-2 Critical Kernel Denial Of Service Errors

ubuntu

January 9, 2023

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

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

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

- linux-aws-5.15: Linux kernel for Amazon Web Services (AWS) systems

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

Details:

Mingwei Zhang discovered that the KVM implementation for AMD processors in

the Linux kernel did not properly handle cache coherency with Secure

Encrypted Virtualization (SEV). A local attacker could possibly use this to

cause a denial of service (host system crash). (CVE-2022-0171)

It was discovered that a race condition existed in the Android Binder IPC

subsystem in the Linux kernel, leading to a use-after-free vulnerability. A

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

or possibly execute arbitrary code. (CVE-2022-...

Read the Full Advisory

Topics Covered

security advisory denial of service critical risk security patch kernel ubuntu system crash

Update Instructions

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

Ubuntu 22.04 LTS:
   linux-image-5.15.0-1027-aws     5.15.0-1027.31
   linux-image-5.15.0-1030-azure   5.15.0-1030.37
   linux-image-5.15.0-1030-azure-fde  5.15.0-1030.37.1
   linux-image-aws                 5.15.0.1027.25
   linux-image-aws-lts-22.04       5.15.0.1027.25
   linux-image-azure               5.15.0.1030.26
   linux-image-azure-fde           5.15.0.1030.37.7
   linux-image-azure-lts-22.04     5.15.0.1030.26

Ubuntu 20.04 LTS:
   linux-image-5.15.0-1027-aws     5.15.0-1027.31~20.04.1
   linux-image-5.15.0-1030-azure   5.15.0-1030.37~20.04.1
   linux-image-aws                 5.15.0.1027.31~20.04.16
   linux-image-azure               5.15.0.1030.37~20.04.20

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.