1. Ubuntu Security Notices
  2. USN-7712-2

USN-7712-2: Linux kernel (Azure) vulnerabilities

Publication date

2 September 2025

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

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:

  • PA-RISC architecture;
  • PowerPC architecture;
  • x86 architecture;
  • Block layer subsystem;
  • Cryptographic API;
  • Serial ATA and Parallel ATA drivers;
  • Bluetooth drivers;
  • Bus devices;
  • CPU frequency scaling framework;
  • Buffer Sharing and Synchronization framework;
  • DMA engine subsystem;
  • Arm Firmware Framework for ARMv8-A(FFA);
  • ARM SCMI message protocol;
  • GPU drivers;
  • HID subsystem;
  • HSI subsystem;
  • I2C subsystem;
  • I3C subsystem;
  • IIO subsystem;
  • InfiniBand drivers;
  • IOMMU subsystem;
  • IRQ chip drivers;
  • MCB driver;
  • Multiple devices driver;
  • Media drivers;
  • Multifunction device...

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:

  • PA-RISC architecture;
  • PowerPC architecture;
  • x86 architecture;
  • Block layer subsystem;
  • Cryptographic API;
  • Serial ATA and Parallel ATA drivers;
  • Bluetooth drivers;
  • Bus devices;
  • CPU frequency scaling framework;
  • Buffer Sharing and Synchronization framework;
  • DMA engine subsystem;
  • Arm Firmware Framework for ARMv8-A(FFA);
  • ARM SCMI message protocol;
  • GPU drivers;
  • HID subsystem;
  • HSI subsystem;
  • I2C subsystem;
  • I3C subsystem;
  • IIO subsystem;
  • InfiniBand drivers;
  • IOMMU subsystem;
  • IRQ chip drivers;
  • MCB driver;
  • Multiple devices driver;
  • Media drivers;
  • Multifunction device drivers;
  • PCI Endpoint Test driver;
  • MTD block device drivers;
  • Network drivers;
  • NVDIMM (Non-Volatile Memory Device) drivers;
  • NVME drivers;
  • Device tree and open firmware driver;
  • PCI subsystem;
  • x86 platform drivers;
  • TI SCI PM domains driver;
  • PWM drivers;
  • S/390 drivers;
  • SCSI subsystem;
  • Samsung SoC drivers;
  • TCM subsystem;
  • TTY drivers;
  • UFS subsystem;
  • Cadence USB3 driver;
  • ChipIdea USB driver;
  • USB Device Class drivers;
  • DesignWare USB3 driver;
  • USB Gadget drivers;
  • USB Type-C support driver;
  • USB Type-C Connector System Software Interface driver;
  • Backlight driver;
  • Framebuffer layer;
  • Virtio drivers;
  • Xen hypervisor drivers;
  • BTRFS file system;
  • Ext4 file system;
  • F2FS file system;
  • File systems infrastructure;
  • JFS file system;
  • Network file system (NFS) client;
  • Network file system (NFS) server daemon;
  • Proc file system;
  • SMB network file system;
  • LZO compression library;
  • Kernel stack handling interfaces;
  • Bluetooth subsystem;
  • Network traffic control;
  • SCTP protocol;
  • Digital Audio (PCM) driver;
  • Tracing infrastructure;
  • BPF subsystem;
  • Padata parallel execution mechanism;
  • Kernel command line parsing driver;
  • Memory management;
  • 802.1Q VLAN protocol;
  • CAN network layer;
  • Networking core;
  • IPv6 networking;
  • MAC80211 subsystem;
  • Management Component Transport Protocol (MCTP);
  • Multipath TCP;
  • Netfilter;
  • Open vSwitch;
  • Phonet protocol;
  • TIPC protocol;
  • TLS protocol;
  • ALSA framework;
  • Virtio sound driver;
  • CPU Power monitoring subsystem

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
20.04 focal linux-image-5.15.0-1094-azure –  5.15.0-1094.103~20.04.1  
linux-image-azure –  5.15.0.1094.103~20.04.1  
linux-image-azure-5.15 –  5.15.0.1094.103~20.04.1  
linux-image-azure-cvm –  5.15.0.1094.103~20.04.1  

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References

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