1. Ubuntu Security Notices
  2. USN-7607-2

USN-7607-2: Linux kernel (FIPS) vulnerabilities

Publication date

1 July 2025

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that a use-after-free vulnerability existed in the
Bluetooth stack in the Linux kernel. A local attacker could use this to
cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2022-3640)

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:

  • SCSI subsystem;
  • Network file system (NFS) client;
  • NILFS2 file system;
  • File systems infrastructure;
  • Memory management;
  • Bluetooth subsystem;
  • Network traffic control;
  • USB sound devices

It was discovered that a use-after-free vulnerability existed in the
Bluetooth stack in the Linux kernel. A local attacker could use this to
cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2022-3640)

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:

  • SCSI subsystem;
  • Network file system (NFS) client;
  • NILFS2 file system;
  • File systems infrastructure;
  • Memory management;
  • Bluetooth subsystem;
  • Network traffic control;
  • USB sound devices

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-4.4.0-1115-fips –  4.4.0-1115.122  
linux-image-fips –  4.4.0.1115.116  

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References

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