1. Ubuntu Security Notices
  2. USN-8726-1

USN-8726-1: Linux kernel vulnerabilities

Publication date

7 September 2026

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-aws-7.0 - Linux kernel for Amazon Web Services (AWS) systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gke - Linux kernel for Google Container Engine (GKE) systems
  • linux-hwe-7.0 - Linux hardware enablement (HWE) kernel
  • linux-realtime - Linux kernel for Real-time systems

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so had been revoked, bypassing memory protections or escalating privileges.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;
  • User-space API (UAPI);
  • Kernel build system;
  • ARM32 architecture;
  • RISC-V architecture;
  • S390 architecture;
  • x86 architecture;
  • Block layer subsystem;
  • Cryptographic API;
  • Compute Acceleration Framework;
  • Intel NPU Driver;
  • ACPI...

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so had been revoked, bypassing memory protections or escalating privileges.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;
  • User-space API (UAPI);
  • Kernel build system;
  • ARM32 architecture;
  • RISC-V architecture;
  • S390 architecture;
  • x86 architecture;
  • Block layer subsystem;
  • Cryptographic API;
  • Compute Acceleration Framework;
  • Intel NPU Driver;
  • ACPI drivers;
  • Android drivers;
  • Drivers core;
  • Compressed RAM block device driver;
  • Bluetooth drivers;
  • Character device driver;
  • Hardware random number generator core;
  • CPU frequency scaling framework;
  • Hardware crypto device drivers;
  • Buffer Sharing and Synchronization framework;
  • Intel Stratix 10 firmware drivers;
  • FPGA Framework;
  • GPIO subsystem;
  • GPU drivers;
  • HID subsystem;
  • CoreSight HW tracing drivers;
  • I2C subsystem;
  • IIO subsystem;
  • IIO ADC drivers;
  • InfiniBand drivers;
  • Input Device core drivers;
  • Input Device (Mouse) drivers;
  • IOMMU subsystem;
  • IRQ chip drivers;
  • Multiple devices driver;
  • Media drivers;
  • Multifunction device drivers;
  • Fastrpc Driver;
  • MMC subsystem;
  • Ethernet bonding driver;
  • Network drivers;
  • Mellanox network drivers;
  • MediaTek network drivers;
  • NTB driver;
  • NVME drivers;
  • NVMEM (Non Volatile Memory) drivers;
  • PCI subsystem;
  • Pin controllers subsystem;
  • x86 platform drivers;
  • System reset/shutdown drivers;
  • Power sequencing drivers;
  • PTP clock framework;
  • Voltage and Current Regulator drivers;
  • RPMSG subsystem;
  • SLIMbus drivers;
  • SPI subsystem;
  • Media staging drivers;
  • Realtek RTL8723BS SDIO drivers;
  • VME bus staging drivers;
  • Trusted Execution Environment drivers;
  • Thunderbolt and USB4 drivers;
  • TTY drivers;
  • Cadence USB3 driver;
  • ULPI bus;
  • DesignWare USB3 driver;
  • Faraday FOTG210 USB2 dual-role controller driver;
  • USB Gadget drivers;
  • USB Host Controller drivers;
  • USB ChaosKey driver;
  • Siemens ID Mouse USB driver;
  • IOWarrior USB driver;
  • LD Didactic USB driver;
  • LEGO USB Tower driver;
  • Intel USBIO USB I/O expander driver;
  • USS720 USB parallel port adapter driver;
  • MediaTek USB3 DRD driver;
  • USB Serial drivers;
  • USB Type-C Port Controller Manager driver;
  • USB Type-C Connector System Software Interface driver;
  • USB over IP driver;
  • VFIO drivers;
  • Framebuffer layer;
  • Virtio drivers;
  • BTRFS file system;
  • EROFS file system;
  • exFAT file system;
  • F2FS file system;
  • File systems infrastructure;
  • FUSE (File system in Userspace);
  • GFS2 file system;
  • HFS file system;
  • HFS+ file system;
  • Network file system (NFS) client;
  • Network file system (NFS) server daemon;
  • NILFS2 file system;
  • NTFS3 file system;
  • OCFS2 file system;
  • Proc file system;
  • SMB network file system;
  • UDF file system;
  • XFS file system;
  • Key management;
  • BPF subsystem;
  • Memory management;
  • Software nodes and device properties;
  • Glob pattern matching library;
  • Memory Management;
  • KVM subsystem;
  • Mellanox drivers;
  • Restartable sequences system call mechanism;
  • Socket messages infrastructure;
  • Network traffic control;
  • Bluetooth subsystem;
  • Netfilter;
  • Networking core;
  • Network sockets;
  • TCP network protocol;
  • io_uring subsystem;
  • IPC subsystem;
  • Audit subsystem;
  • Perf events;
  • Kernel fork() syscall;
  • Locking primitives;
  • Kernel module support;
  • Scheduler infrastructure;
  • Signal handling mechanism;
  • Timer subsystem;
  • Tracing infrastructure;
  • Debug objects infrastructure;
  • 6LoWPAN network protocol;
  • IEEE 802 network protocols;
  • 9P file system network protocol;
  • B.A.T.M.A.N. meshing protocol;
  • Ethernet bridge;
  • Devlink API;
  • HSR network protocol;
  • IEEE802154.4 network protocol;
  • IPv4 networking;
  • IPv6 networking;
  • XFRM subsystem;
  • L2TP protocol;
  • MAC80211 subsystem;
  • IEEE 802.15.4 subsystem;
  • Multipath TCP;
  • NetLabel subsystem;
  • Open vSwitch;
  • Phonet protocol;
  • Qualcomm IPC Router (QRTR);
  • RDS protocol;
  • SCTP protocol;
  • SMC sockets;
  • TIPC protocol;
  • TLS protocol;
  • Unix domain sockets;
  • VMware vSockets driver;
  • Wireless networking;
  • eXpress Data Path;
  • AppArmor security module;
  • Linux Security Modules (LSM) Framework;
  • Apple Onboard Audio ALSA driver;
  • ALSA framework;
  • FireWire sound drivers;
  • HD-audio driver;
  • Gravis UltraSound ALSA driver;
  • C-Media CMI8x38 ALSA driver;
  • ESS Solo-1 ALSA driver;
  • ICE1712/ICE1724 (Envy24) ALSA driver;
  • Yamaha YMFPCI ALSA driver;
  • Wolfson Microelectronics audio codecs;
  • SoundWire (SDCA) ASoC drivers;
  • USB sound devices;
  • Virtio sound driver

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
26.04 LTS resolute linux-image-7.0.0-1006-gke –  7.0.0-1006.7
linux-image-7.0.0-1006-gke-64k –  7.0.0-1006.7
linux-image-7.0.0-1011-gcp –  7.0.0-1011.11
linux-image-7.0.0-1011-gcp-64k –  7.0.0-1011.11
linux-image-7.0.0-1012-aws –  7.0.0-1012.12
linux-image-7.0.0-1012-aws-64k –  7.0.0-1012.12
linux-image-7.0.0-31-generic –  7.0.0-31.31
linux-image-7.0.0-31-generic-64k –  7.0.0-31.31
linux-image-7.0.0-31-realtime –  7.0.0-31.31.1
linux-image-7.0.0-31-realtime-64k –  7.0.0-31.31.1
linux-image-aws –  7.0.0-1012.12
linux-image-aws-64k –  7.0.0-1012.12
linux-image-aws-64k-7.0 –  7.0.0-1012.12
linux-image-aws-7.0 –  7.0.0-1012.12
linux-image-gcp –  7.0.0-1011.11
linux-image-gcp-64k –  7.0.0-1011.11
linux-image-gcp-64k-7.0 –  7.0.0-1011.11
linux-image-gcp-7.0 –  7.0.0-1011.11
linux-image-generic –  7.0.0-31.31
linux-image-generic-64k –  7.0.0-31.31
linux-image-generic-64k-7.0 –  7.0.0-31.31
linux-image-generic-64k-hwe-26.04 –  7.0.0-31.31
linux-image-generic-7.0 –  7.0.0-31.31
linux-image-generic-hwe-26.04 –  7.0.0-31.31
linux-image-gke –  7.0.0-1006.7
linux-image-gke-64k –  7.0.0-1006.7
linux-image-gke-64k-7.0 –  7.0.0-1006.7
linux-image-gke-64k-hwe-26.04 –  7.0.0-1006.7
linux-image-gke-7.0 –  7.0.0-1006.7
linux-image-gke-hwe-26.04 –  7.0.0-1006.7
linux-image-realtime –  7.0.0-31.31.1
linux-image-realtime-64k –  7.0.0-31.31.1
linux-image-realtime-64k-7.0 –  7.0.0-31.31.1
linux-image-realtime-64k-hwe-26.04 –  7.0.0-31.31.1
linux-image-realtime-7.0 –  7.0.0-31.31.1
linux-image-realtime-hwe-26.04 –  7.0.0-31.31.1
linux-image-virtual –  7.0.0-31.31
linux-image-virtual-7.0 –  7.0.0-31.31
linux-image-virtual-hwe-26.04 –  7.0.0-31.31
24.04 LTS noble linux-image-7.0.0-1012-aws –  7.0.0-1012.12~24.04.1
linux-image-7.0.0-1012-aws-64k –  7.0.0-1012.12~24.04.1
linux-image-7.0.0-31-generic –  7.0.0-31.31~24.04.1
linux-image-7.0.0-31-generic-64k –  7.0.0-31.31~24.04.1
linux-image-aws –  7.0.0-1012.12~24.04.1
linux-image-aws-64k –  7.0.0-1012.12~24.04.1
linux-image-aws-64k-7.0 –  7.0.0-1012.12~24.04.1
linux-image-aws-7.0 –  7.0.0-1012.12~24.04.1
linux-image-generic-64k-7.0 –  7.0.0-31.31~24.04.1
linux-image-generic-64k-hwe-24.04 –  7.0.0-31.31~24.04.1
linux-image-generic-7.0 –  7.0.0-31.31~24.04.1
linux-image-generic-hwe-24.04 –  7.0.0-31.31~24.04.1
linux-image-virtual-7.0 –  7.0.0-31.31~24.04.1
linux-image-virtual-hwe-24.04 –  7.0.0-31.31~24.04.1

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References

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