1. Ubuntu Security Notices
  2. USN-6646-1

USN-6646-1: Linux kernel vulnerabilities

Publication date

20 February 2024

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty

Details

It was discovered that a race condition existed in the ATM (Asynchronous
Transfer Mode) subsystem of 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-2023-51780)

It was discovered that a race condition existed in the Rose X.25 protocol
implementation 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-2023-51782)

It was discovered that the netfilter connection tracker for netlink in the
Linux kernel did not properly perform reference counting in some error
conditions. A local attacker could possibly use this to cause a denial of
service (memory exhaustion). (

It was discovered that a race condition existed in the ATM (Asynchronous
Transfer Mode) subsystem of 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-2023-51780)

It was discovered that a race condition existed in the Rose X.25 protocol
implementation 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-2023-51782)

It was discovered that the netfilter connection tracker for netlink in the
Linux kernel did not properly perform reference counting in some error
conditions. A local attacker could possibly use this to cause a denial of
service (memory exhaustion). (CVE-2023-7192)

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
16.04 xenial linux-image-4.4.0-1129-kvm –  4.4.0-1129.139  
linux-image-4.4.0-1166-aws –  4.4.0-1166.181  
linux-image-4.4.0-251-generic –  4.4.0-251.285  
linux-image-4.4.0-251-lowlatency –  4.4.0-251.285  
linux-image-aws –  4.4.0.1166.170  
linux-image-generic –  4.4.0.251.257  
linux-image-generic-lts-xenial –  4.4.0.251.257  
linux-image-kvm –  4.4.0.1129.126  
linux-image-lowlatency –  4.4.0.251.257  
linux-image-lowlatency-lts-xenial –  4.4.0.251.257  
linux-image-virtual –  4.4.0.251.257  
linux-image-virtual-lts-xenial –  4.4.0.251.257  
14.04 trusty linux-image-4.4.0-1128-aws –  4.4.0-1128.134  
linux-image-4.4.0-251-generic –  4.4.0-251.285~14.04.1  
linux-image-4.4.0-251-lowlatency –  4.4.0-251.285~14.04.1  
linux-image-aws –  4.4.0.1128.125  

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References

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