1. Ubuntu Security Notices
  2. USN-7234-1

USN-7234-1: Linux kernel vulnerabilities

Publication date

28 January 2025

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

Ye Zhang and Nicolas Wu discovered that the io_uring subsystem in the Linux
kernel did not properly handle locking for rings with IOPOLL, leading to a
double-free vulnerability. A local attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2023-21400)

Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:

  • TTY drivers;
  • Netfilter;
  • Network traffic control;
  • VMware vSockets driver

Ye Zhang and Nicolas Wu discovered that the io_uring subsystem in the Linux
kernel did not properly handle locking for rings with IOPOLL, leading to a
double-free vulnerability. A local attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2023-21400)

Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:

  • TTY drivers;
  • Netfilter;
  • Network traffic control;
  • VMware vSockets driver

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
20.04 focal linux-image-5.4.0-1085-ibm –  5.4.0-1085.90
linux-image-5.4.0-1098-bluefield –  5.4.0-1098.105
linux-image-5.4.0-1122-raspi –  5.4.0-1122.134
linux-image-5.4.0-1126-kvm –  5.4.0-1126.134
linux-image-5.4.0-1137-oracle –  5.4.0-1137.146
linux-image-5.4.0-1142-gcp –  5.4.0-1142.151
linux-image-5.4.0-205-generic –  5.4.0-205.225
linux-image-5.4.0-205-generic-lpae –  5.4.0-205.225
linux-image-5.4.0-205-lowlatency –  5.4.0-205.225
linux-image-bluefield –  5.4.0.1098.94
linux-image-gcp-lts-20.04 –  5.4.0.1142.144
linux-image-generic –  5.4.0.205.201
linux-image-generic-lpae –  5.4.0.205.201
linux-image-ibm-lts-20.04 –  5.4.0.1085.114
linux-image-kvm –  5.4.0.1126.122
linux-image-lowlatency –  5.4.0.205.201
linux-image-oem –  5.4.0.205.201
linux-image-oem-osp1 –  5.4.0.205.201
linux-image-oracle-lts-20.04 –  5.4.0.1137.130
linux-image-raspi –  5.4.0.1122.152
linux-image-raspi2 –  5.4.0.1122.152
linux-image-virtual –  5.4.0.205.201
18.04 bionic linux-image-5.4.0-1085-ibm –  5.4.0-1085.90~18.04.1  
linux-image-5.4.0-1137-oracle –  5.4.0-1137.146~18.04.1  
linux-image-5.4.0-1142-gcp –  5.4.0-1142.151~18.04.1  
linux-image-gcp –  5.4.0.1142.151~18.04.1  
linux-image-ibm –  5.4.0.1085.90~18.04.1  
linux-image-oracle –  5.4.0.1137.146~18.04.1  

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

id="usn"

Have additional questions?

Talk to a member of the team ›