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

USN-7607-1: Linux kernel vulnerabilities

Publication date

1 July 2025

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-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty

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-4.4.0-1183-aws –  4.4.0-1183.198  
linux-image-4.4.0-270-generic –  4.4.0-270.304  
linux-image-4.4.0-270-lowlatency –  4.4.0-270.304  
linux-image-aws –  4.4.0.1183.187  
linux-image-generic –  4.4.0.270.276  
linux-image-generic-lts-xenial –  4.4.0.270.276  
linux-image-lowlatency –  4.4.0.270.276  
linux-image-lowlatency-lts-xenial –  4.4.0.270.276  
linux-image-virtual –  4.4.0.270.276  
linux-image-virtual-lts-xenial –  4.4.0.270.276  
14.04 trusty linux-image-4.4.0-1145-aws –  4.4.0-1145.151  
linux-image-4.4.0-270-generic –  4.4.0-270.304~14.04.1  
linux-image-4.4.0-270-lowlatency –  4.4.0-270.304~14.04.1  
linux-image-aws –  4.4.0.1145.142  
linux-image-generic-lts-xenial –  4.4.0.270.304~14.04.1  
linux-image-lowlatency-lts-xenial –  4.4.0.270.304~14.04.1  
linux-image-virtual-lts-xenial –  4.4.0.270.304~14.04.1  

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 ›