1. Ubuntu Security Notices
  2. USN-6777-2

USN-6777-2: Linux kernel (Azure) vulnerabilities

Publication date

20 May 2024

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux-azure - Linux kernel for Microsoft Azure Cloud systems

Details

Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could possibly
use this to cause a denial of service (system crash). (CVE-2023-47233)

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:

  • Block layer subsystem;
  • Userspace I/O drivers;
  • Ceph distributed file system;
  • Ext4 file system;
  • JFS file system;
  • NILFS2 file system;
  • Bluetooth subsystem;
  • Networking core;
  • IPv4 networking;
  • IPv6 networking;
  • Logical Link layer;
  • MAC80211 subsystem;
  • Netlink;
  • NFC subsystem;
  • Tomoyo security module

Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could possibly
use this to cause a denial of service (system crash). (CVE-2023-47233)

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:

  • Block layer subsystem;
  • Userspace I/O drivers;
  • Ceph distributed file system;
  • Ext4 file system;
  • JFS file system;
  • NILFS2 file system;
  • Bluetooth subsystem;
  • Networking core;
  • IPv4 networking;
  • IPv6 networking;
  • Logical Link layer;
  • MAC80211 subsystem;
  • Netlink;
  • NFC subsystem;
  • Tomoyo security module

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-4.15.0-1177-azure –  4.15.0-1177.192~16.04.1  
linux-image-azure –  4.15.0.1177.192~16.04.1  
14.04 trusty linux-image-4.15.0-1177-azure –  4.15.0-1177.192~14.04.1  
linux-image-azure –  4.15.0.1177.192~14.04.1  

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References

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