1. Ubuntu Security Notices
  2. USN-8906-1

USN-8906-1: Linux kernel (IBM) vulnerabilities

Publication date

8 October 2026

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that some Arm processors could complete a broadcast
translation lookaside buffer (TLB) invalidation before memory writes made
through the invalidated translation were globally observed. A local
attacker could possibly use this to write to memory after permission to do
so had been revoked, bypassing memory protections or escalating privileges.
(CVE-2025-10263)

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;
  • ARM32 architecture;
  • MIPS architecture;
  • PowerPC architecture;
  • x86 architecture;
  • Intel NPU Driver;
  • Compute Acceleration Framework;
  • Auxiliary display drivers;
  • Drivers core;
  • Compressed RAM block device driver;
  • Bluetooth...

It was discovered that some Arm processors could complete a broadcast
translation lookaside buffer (TLB) invalidation before memory writes made
through the invalidated translation were globally observed. A local
attacker could possibly use this to write to memory after permission to do
so had been revoked, bypassing memory protections or escalating privileges.
(CVE-2025-10263)

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;
  • ARM32 architecture;
  • MIPS architecture;
  • PowerPC architecture;
  • x86 architecture;
  • Intel NPU Driver;
  • Compute Acceleration Framework;
  • Auxiliary display drivers;
  • Drivers core;
  • Compressed RAM block device driver;
  • Bluetooth drivers;
  • Arm Firmware Framework for ARMv8-A(FFA);
  • EFI core;
  • GPIO subsystem;
  • GPU drivers;
  • HID subsystem;
  • Hardware monitoring drivers;
  • I2C subsystem;
  • IIO subsystem;
  • InfiniBand drivers;
  • Input Device core drivers;
  • Input Device (Mouse) drivers;
  • Multiple devices driver;
  • Media drivers;
  • Fastrpc Driver;
  • Ethernet bonding driver;
  • Network drivers;
  • Mellanox network drivers;
  • Microsoft Azure Network Adapter (MANA) driver;
  • Texas Instruments network drivers;
  • NVMEM (Non Volatile Memory) drivers;
  • Parport drivers;
  • SCSI subsystem;
  • SLIMbus drivers;
  • NVIDIA Tegra SoC drivers;
  • SPI subsystem;
  • TCM subsystem;
  • Trusted Execution Environment drivers;
  • Thunderbolt and USB4 drivers;
  • TTY drivers;
  • USB Device Class drivers;
  • DesignWare USB2 driver;
  • USB Gadget drivers;
  • USB Dual Role (OTG-ready) Controller drivers;
  • USB Serial drivers;
  • USB Type-C support driver;
  • USB Type-C Port Controller Manager driver;
  • USB Type-C Connector System Software Interface driver;
  • USB over IP driver;
  • Framebuffer layer;
  • Ext4 file system;
  • FUSE (File system in Userspace);
  • File systems infrastructure;
  • Network file systems library;
  • NTFS3 file system;
  • SMB network file system;
  • Software nodes and device properties;
  • Mellanox drivers;
  • Network traffic control;
  • Bluetooth subsystem;
  • IPv4 networking;
  • Netfilter;
  • IPv6 networking;
  • Network sockets;
  • XFRM subsystem;
  • Tracing infrastructure;
  • io_uring subsystem;
  • IPC subsystem;
  • IRQ subsystem;
  • Signal handling mechanism;
  • KProbes tracing;
  • Memory management;
  • 6LoWPAN network protocol;
  • IEEE 802 network protocols;
  • B.A.T.M.A.N. meshing protocol;
  • Ethernet bridge;
  • Networking core;
  • Devlink API;
  • Ethtool driver;
  • Handshake API;
  • HSR network protocol;
  • IEEE802154.4 network protocol;
  • IUCV driver;
  • L2TP protocol;
  • MAC80211 subsystem;
  • Management Component Transport Protocol (MCTP);
  • Multipath TCP;
  • NetLabel subsystem;
  • NFC subsystem;
  • Open vSwitch;
  • Phonet protocol;
  • Qualcomm IPC Router (QRTR);
  • RDS protocol;
  • RxRPC session sockets;
  • SCTP protocol;
  • SMC sockets;
  • TLS protocol;
  • Unix domain sockets;
  • VMware vSockets driver;
  • Wireless networking;
  • Key management;
  • Linux Security Modules (LSM) Framework;
  • ALSA framework;
  • AudioScience HPI driver;
  • Simple audio multiplexer codec driver;
  • Wolfson Microelectronics audio codecs;
  • KVM 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
22.04 LTS jammy linux-image-6.8.0-1066-ibm –  6.8.0-1066.67~22.04.1
linux-image-ibm-6.8 –  6.8.0-1066.67~22.04.1

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References

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