1. Ubuntu Security Notices
  2. USN-7721-1

USN-7721-1: Linux kernel (Azure) vulnerabilities

Publication date

28 August 2025

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

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

Details

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:

  • ARM64 architecture;
  • PA-RISC architecture;
  • PowerPC architecture;
  • RISC-V architecture;
  • S390 architecture;
  • x86 architecture;
  • Compute Acceleration Framework;
  • Ublk userspace block driver;
  • Bluetooth drivers;
  • Buffer Sharing and Synchronization framework;
  • DMA engine subsystem;
  • ARM SCMI message protocol;
  • GPU drivers;
  • HID subsystem;
  • IIO ADC drivers;
  • IIO subsystem;
  • InfiniBand drivers;
  • Input Device core drivers;
  • IOMMU subsystem;
  • IRQ chip drivers;
  • Multiple devices driver;
  • Network drivers;
  • Mellanox network drivers;
  • PCI subsystem;
  • PHY drivers;
  • PTP clock...

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:

  • ARM64 architecture;
  • PA-RISC architecture;
  • PowerPC architecture;
  • RISC-V architecture;
  • S390 architecture;
  • x86 architecture;
  • Compute Acceleration Framework;
  • Ublk userspace block driver;
  • Bluetooth drivers;
  • Buffer Sharing and Synchronization framework;
  • DMA engine subsystem;
  • ARM SCMI message protocol;
  • GPU drivers;
  • HID subsystem;
  • IIO ADC drivers;
  • IIO subsystem;
  • InfiniBand drivers;
  • Input Device core drivers;
  • IOMMU subsystem;
  • IRQ chip drivers;
  • Multiple devices driver;
  • Network drivers;
  • Mellanox network drivers;
  • PCI subsystem;
  • PHY drivers;
  • PTP clock framework;
  • Voltage and Current Regulator drivers;
  • SPI subsystem;
  • VideoCore services drivers;
  • USB Type-C Connector System Software Interface driver;
  • Xen hypervisor drivers;
  • BTRFS file system;
  • EROFS file system;
  • Network file system (NFS) client;
  • File systems infrastructure;
  • SMB network file system;
  • Network traffic control;
  • eXpress Data Path;
  • Universal MIDI packet (UMP) support module;
  • io_uring subsystem;
  • Kernel command line parsing driver;
  • Scheduler infrastructure;
  • Tracing infrastructure;
  • Memory management;
  • Networking core;
  • IPv4 networking;
  • IPv6 networking;
  • MAC80211 subsystem;
  • Management Component Transport Protocol (MCTP);
  • Netfilter;
  • Open vSwitch;
  • TLS protocol;
  • Wireless networking;
  • AMD SoC Alsa drivers;
  • SoC Audio generic drivers;
  • SOF drivers

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
25.04 plucky linux-image-6.14.0-1010-azure –  6.14.0-1010.10
linux-image-azure –  6.14.0-1010.10
linux-image-azure-6.14 –  6.14.0-1010.10

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References

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