1. Ubuntu Security Notices
  2. USN-6739-1

USN-6739-1: Linux kernel vulnerabilities

Publication date

19 April 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 instruction emulator
of the Linux kernel on Arm 64-bit systems. A local attacker could use this
to cause a denial of service (system crash). (CVE-2022-20422)

Wei Chen discovered that a race condition existed in the TIPC protocol
implementation in the Linux kernel, leading to a null pointer dereference
vulnerability. A local attacker could use this to cause a denial of service
(system crash). (CVE-2023-1382)

Jose Oliveira and Rodrigo Branco discovered that the Spectre Variant 2
mitigations with prctl syscall were insufficient in some situations. A
local attacker could possibly use this to expose sensitive information.
(CVE-2023-1998)

Daniele Antonioli discovered that the Secure Simple Pairing and Secure
Connections pairing in the Bluetooth protocol could...

It was discovered that a race condition existed in the instruction emulator
of the Linux kernel on Arm 64-bit systems. A local attacker could use this
to cause a denial of service (system crash). (CVE-2022-20422)

Wei Chen discovered that a race condition existed in the TIPC protocol
implementation in the Linux kernel, leading to a null pointer dereference
vulnerability. A local attacker could use this to cause a denial of service
(system crash). (CVE-2023-1382)

Jose Oliveira and Rodrigo Branco discovered that the Spectre Variant 2
mitigations with prctl syscall were insufficient in some situations. A
local attacker could possibly use this to expose sensitive information.
(CVE-2023-1998)

Daniele Antonioli discovered that the Secure Simple Pairing and Secure
Connections pairing in the Bluetooth protocol could allow an
unauthenticated user to complete authentication without pairing
credentials. A physically proximate attacker placed between two Bluetooth
devices could use this to subsequently impersonate one of the paired
devices. (CVE-2023-24023)

shanzhulig discovered that the DRM subsystem in the Linux kernel contained
a race condition when performing certain operation while handling driver
unload, 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-2023-51043)

It was 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-2023-51779)

It was discovered that the device mapper driver in the Linux kernel did not
properly validate target size during certain memory allocations. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2023-52429, CVE-2024-23851)

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:

  • Architecture specifics;
  • ACPI drivers;
  • I2C subsystem;
  • Media drivers;
  • JFS file system;
  • IPv4 Networking;
  • Open vSwitch

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-4.4.0-1131-kvm –  4.4.0-1131.141  
linux-image-4.4.0-1168-aws –  4.4.0-1168.183  
linux-image-4.4.0-253-generic –  4.4.0-253.287  
linux-image-4.4.0-253-lowlatency –  4.4.0-253.287  
linux-image-aws –  4.4.0.1168.172  
linux-image-generic –  4.4.0.253.259  
linux-image-generic-lts-xenial –  4.4.0.253.259  
linux-image-kvm –  4.4.0.1131.128  
linux-image-lowlatency –  4.4.0.253.259  
linux-image-lowlatency-lts-xenial –  4.4.0.253.259  
linux-image-virtual –  4.4.0.253.259  
linux-image-virtual-lts-xenial –  4.4.0.253.259  
14.04 trusty linux-image-4.4.0-1130-aws –  4.4.0-1130.136  
linux-image-4.4.0-253-generic –  4.4.0-253.287~14.04.1  
linux-image-4.4.0-253-lowlatency –  4.4.0-253.287~14.04.1  
linux-image-aws –  4.4.0.1130.127  
linux-image-generic-lts-xenial –  4.4.0.253.287~14.04.1  
linux-image-lowlatency-lts-xenial –  4.4.0.253.287~14.04.1  
linux-image-virtual-lts-xenial –  4.4.0.253.287~14.04.1  

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References

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