1. Ubuntu Security Notices
  2. USN-8488-1

USN-8488-1: Linux kernel vulnerabilities

Publication date

1 July 2026

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)

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;
  • x86 architecture;
  • Block layer subsystem;
  • Cryptographic API;
  • Rados block device (RBD) driver;
  • Compressed RAM block device driver;
  • Character device driver;
  • TPM device driver;
  • Hardware crypto device drivers;
  • EDAC drivers;
  • GPU drivers;
  • Greybus drivers;
  • HID subsystem;
  • Microsoft Hyper-V drivers;
  • Hardware monitoring drivers;
  • I2C subsystem;
  • IIO...

It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)

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;
  • x86 architecture;
  • Block layer subsystem;
  • Cryptographic API;
  • Rados block device (RBD) driver;
  • Compressed RAM block device driver;
  • Character device driver;
  • TPM device driver;
  • Hardware crypto device drivers;
  • EDAC drivers;
  • GPU drivers;
  • Greybus drivers;
  • HID subsystem;
  • Microsoft Hyper-V drivers;
  • Hardware monitoring drivers;
  • I2C subsystem;
  • IIO subsystem;
  • InfiniBand drivers;
  • Input Device core drivers;
  • LED subsystem;
  • Multiple devices driver;
  • Media drivers;
  • IBM Advanced System Management driver;
  • MTD block device drivers;
  • Network drivers;
  • Microsoft Azure Network Adapter (MANA) driver;
  • NTB driver;
  • NVME drivers;
  • Device tree and open firmware driver;
  • PCI subsystem;
  • Remote Processor subsystem;
  • SCSI subsystem;
  • SPI subsystem;
  • Realtek RTL8723BS SDIO drivers;
  • SM750 framebuffer staging driver;
  • Thermal drivers;
  • USB Gadget drivers;
  • USB over IP driver;
  • VFIO drivers;
  • Framebuffer layer;
  • 9P distributed file system;
  • AFS file system;
  • Ceph distributed file system;
  • File systems infrastructure;
  • EROFS file system;
  • Ext4 file system;
  • F2FS file system;
  • FUSE (File system in Userspace);
  • Journaling layer for block devices (JBD2);
  • NILFS2 file system;
  • File system notification infrastructure;
  • NTFS3 file system;
  • OCFS2 file system;
  • SMB network file system;
  • UDF file system;
  • XFS file system;
  • Codetag library;
  • Memory management;
  • Memory Management;
  • KVM subsystem;
  • Tracing infrastructure;
  • User-space API (UAPI);
  • io_uring subsystem;
  • Locking primitives;
  • Timer subsystem;
  • Scatterlist API;
  • Heterogeneous memory management;
  • KASAN memory debugging framework;
  • Bluetooth subsystem;
  • Ethernet bridge;
  • CAIF protocol;
  • CAN network layer;
  • Ceph Core library;
  • IPv4 networking;
  • IPv6 networking;
  • Multipath TCP;
  • Netfilter;
  • NFC subsystem;
  • Packet sockets;
  • Qualcomm IPC Router (QRTR);
  • RDS protocol;
  • RxRPC session sockets;
  • SMC sockets;
  • Stream parser;
  • Landlock security;
  • SELinux security module;
  • ALSA framework;
  • Generic PCM loopback sound driver;
  • FireWire sound drivers;
  • Creative Sound Blaster X-Fi driver;
  • QCOM ASoC drivers;
  • USB sound devices;
  • Objtool

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-7.0.0-27-generic –  7.0.0-27.27
linux-image-7.0.0-27-generic-64k –  7.0.0-27.27
linux-image-generic –  7.0.0-27.27
linux-image-generic-64k –  7.0.0-27.27
linux-image-generic-64k-7.0 –  7.0.0-27.27
linux-image-generic-64k-hwe-26.04 –  7.0.0-27.27
linux-image-generic-7.0 –  7.0.0-27.27
linux-image-generic-hwe-26.04 –  7.0.0-27.27
linux-image-oem-24.04 –  7.0.0-27.27
linux-image-oem-24.04a –  7.0.0-27.27
linux-image-oem-24.04b –  7.0.0-27.27
linux-image-oem-24.04c –  7.0.0-27.27
linux-image-oem-24.04d –  7.0.0-27.27
linux-image-virtual –  7.0.0-27.27
linux-image-virtual-7.0 –  7.0.0-27.27
linux-image-virtual-hwe-26.04 –  7.0.0-27.27

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›