1. Ubuntu Security Notices
  2. USN-8924-1

USN-8924-1: Linux kernel vulnerabilities

Publication date

13 October 2026

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that the timer stats implementation in the Linux kernel
allowed the discovery of a real PID value while inside a PID namespace. A
local attacker could use this to expose sensitive information.
(CVE-2017-5967)

Wen Xu discovered that the XFS file system implementation in the Linux
kernel did not properly track inode validations. An attacker could use this
to construct a malicious XFS image that, when mounted, could cause a denial
of service (system crash). (CVE-2018-13093)

Wen Xu discovered that the f2fs file system implementation in the Linux
kernel did not properly validate metadata. An attacker could use this to
construct a malicious f2fs image that, when mounted, could cause a denial
of service (system crash). (CVE-2018-13097, CVE-2018-13100)

It was...

It was discovered that the timer stats implementation in the Linux kernel
allowed the discovery of a real PID value while inside a PID namespace. A
local attacker could use this to expose sensitive information.
(CVE-2017-5967)

Wen Xu discovered that the XFS file system implementation in the Linux
kernel did not properly track inode validations. An attacker could use this
to construct a malicious XFS image that, when mounted, could cause a denial
of service (system crash). (CVE-2018-13093)

Wen Xu discovered that the f2fs file system implementation in the Linux
kernel did not properly validate metadata. An attacker could use this to
construct a malicious f2fs image that, when mounted, could cause a denial
of service (system crash). (CVE-2018-13097, CVE-2018-13100)

It was discovered that the Qualcomm Atheros 60GHz wireless driver in the
Linux kernel contained an integer overflow when validating the length of
certain information elements, leading to a buffer overflow. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2018-5848)

Likang Luo discovered that a race condition existed in the Bluetooth
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-2021-3752)

It was discovered that the eventpoll (aka epoll) implementation in the
Linux kernel did not properly handle certain error conditions when adding
file descriptors, 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-2021-39634)

Jann Horn discovered a race condition in the Unix domain socket
implementation in the Linux kernel that could result in a read-after-free.
A local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2021-4083)

Lyu Tao discovered that the NFS implementation in the Linux kernel did not
properly handle requests to open a directory on a regular file. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2022-24448)

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:

  • IPv6 networking;
  • Netfilter

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
14.04 LTS trusty linux-image-3.13.0-218-generic –  3.13.0-218.269  
linux-image-3.13.0-218-lowlatency –  3.13.0-218.269  
linux-image-generic –  3.13.0.218.228  
linux-image-generic-lts-trusty –  3.13.0.218.228  
linux-image-lowlatency –  3.13.0.218.228  
linux-image-server –  3.13.0.218.228  
linux-image-virtual –  3.13.0.218.228  

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References

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