1. Ubuntu Security Notices
  2. USN-5557-1

USN-5557-1: Linux kernel vulnerabilities

Publication date

9 August 2022

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

Zhenpeng Lin discovered that the network packet scheduler implementation in
the Linux kernel did not properly remove all references to a route filter
before freeing it in some situations. A local attacker could use this to
cause a denial of service (system crash) or execute arbitrary code.
(CVE-2022-2588)

It was discovered that the netfilter subsystem of the Linux kernel did not
prevent one nft object from referencing an nft set in another nft table,
leading to a use-after-free vulnerability. A local attacker could use this
to cause a denial of service (system crash) or execute arbitrary code.
(CVE-2022-2586)

Zhenpeng Lin discovered that the network packet scheduler implementation in
the Linux kernel did not properly remove all references to a route filter
before freeing it in some situations. A local attacker could use this to
cause a denial of service (system crash) or execute arbitrary code.
(CVE-2022-2588)

It was discovered that the netfilter subsystem of the Linux kernel did not
prevent one nft object from referencing an nft set in another nft table,
leading to a use-after-free vulnerability. A local attacker could use this
to cause a denial of service (system crash) or execute arbitrary code.
(CVE-2022-2586)

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-virtual –  4.4.0.231.237  
linux-image-generic –  4.4.0.231.237  
linux-image-aws –  4.4.0.1147.151  
linux-image-4.4.0-1112-kvm –  4.4.0-1112.122  
linux-image-4.4.0-231-lowlatency –  4.4.0-231.265  
linux-image-4.4.0-1147-aws –  4.4.0-1147.162  
linux-image-4.4.0-231-generic –  4.4.0-231.265  
linux-image-kvm –  4.4.0.1112.109  
linux-image-lowlatency –  4.4.0.231.237  
14.04 trusty linux-image-4.4.0-231-lowlatency –  4.4.0-231.265~14.04.1  
linux-image-generic-lts-xenial –  4.4.0.231.201  
linux-image-4.4.0-231-generic –  4.4.0-231.265~14.04.1  
linux-image-4.4.0-1111-aws –  4.4.0-1111.117  
linux-image-lowlatency-lts-xenial –  4.4.0.231.201  
linux-image-aws –  4.4.0.1111.108  
linux-image-virtual-lts-xenial –  4.4.0.231.201  

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References

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