1. Ubuntu Security Notices
  2. USN-6095-1

USN-6095-1: Linux kernel vulnerabilities

Publication date

22 May 2023

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-raspi2 - Linux kernel for Raspberry Pi systems
  • linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors

Details

Jordy Zomer and Alexandra Sandulescu discovered that the Linux kernel did
not properly implement speculative execution barriers in usercopy functions
in certain situations. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2023-0459)

Xingyuan Mo discovered that the x86 KVM implementation in the Linux kernel
did not properly initialize some data structures. A local attacker could
use this to expose sensitive information (kernel memory). (CVE-2023-1513)

It was discovered that a use-after-free vulnerability existed in the iSCSI
TCP implementation in the Linux kernel. A local attacker could possibly use
this to cause a denial of service (system crash). (CVE-2023-2162)

It was discovered that the NET/ROM protocol implementation in the Linux
kernel contained a race condition in some...

Jordy Zomer and Alexandra Sandulescu discovered that the Linux kernel did
not properly implement speculative execution barriers in usercopy functions
in certain situations. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2023-0459)

Xingyuan Mo discovered that the x86 KVM implementation in the Linux kernel
did not properly initialize some data structures. A local attacker could
use this to expose sensitive information (kernel memory). (CVE-2023-1513)

It was discovered that a use-after-free vulnerability existed in the iSCSI
TCP implementation in the Linux kernel. A local attacker could possibly use
this to cause a denial of service (system crash). (CVE-2023-2162)

It was discovered that the NET/ROM protocol implementation in the Linux
kernel contained a race condition in some situations, 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-2023-32269)

Duoming Zhou discovered that a race condition existed in the infrared
receiver/transceiver driver in the Linux kernel, leading to a use-after-
free vulnerability. A privileged attacker could use this to cause a denial
of service (system crash) or possibly execute arbitrary code.
(CVE-2023-1118)

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
18.04 bionic linux-image-4.15.0-1150-snapdragon –  4.15.0-1150.160
linux-image-snapdragon –  4.15.0.1150.149
linux-image-raspi2 –  4.15.0.1132.127
linux-image-4.15.0-1132-raspi2 –  4.15.0-1132.140
16.04 xenial linux-image-generic-hwe-16.04 –  4.15.0.211.196  
linux-image-4.15.0-211-generic –  4.15.0-211.222~16.04.1  
linux-image-4.15.0-1150-gcp –  4.15.0-1150.166~16.04.1  
linux-image-4.15.0-211-lowlatency –  4.15.0-211.222~16.04.1  
linux-image-gke –  4.15.0.1150.140  
linux-image-virtual-hwe-16.04 –  4.15.0.211.196  
linux-image-oem –  4.15.0.211.196  
linux-image-gcp –  4.15.0.1150.140  
linux-image-lowlatency-hwe-16.04 –  4.15.0.211.196  

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References

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