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

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-ibm - Linux kernel for IBM cloud systems
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-raspi - Linux kernel for Raspberry Pi systems
  • linux-realtime - Linux kernel for Real-time systems

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-7.0.0-1007-gcp –  7.0.0-1007.7
linux-image-7.0.0-1007-gcp-64k –  7.0.0-1007.7
linux-image-7.0.0-1007-oracle –  7.0.0-1007.7
linux-image-7.0.0-1007-oracle-64k –  7.0.0-1007.7
linux-image-7.0.0-1008-aws –  7.0.0-1008.8
linux-image-7.0.0-1008-aws-64k –  7.0.0-1008.8
linux-image-7.0.0-1009-ibm –  7.0.0-1009.9
linux-image-7.0.0-1014-raspi –  7.0.0-1014.14
linux-image-7.0.0-1014-raspi-realtime –  7.0.0-1014.14
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-7.0.0-27-realtime –  7.0.0-27.27.1
linux-image-7.0.0-27-realtime-64k –  7.0.0-27.27.1
linux-image-aws –  7.0.0-1008.8
linux-image-aws-64k –  7.0.0-1008.8
linux-image-aws-64k-7.0 –  7.0.0-1008.8
linux-image-aws-7.0 –  7.0.0-1008.8
linux-image-gcp –  7.0.0-1007.7
linux-image-gcp-64k –  7.0.0-1007.7
linux-image-gcp-64k-7.0 –  7.0.0-1007.7
linux-image-gcp-7.0 –  7.0.0-1007.7
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-ibm –  7.0.0-1009.9
linux-image-ibm-7.0 –  7.0.0-1009.9
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-oracle –  7.0.0-1007.7
linux-image-oracle-64k –  7.0.0-1007.7
linux-image-oracle-64k-7.0 –  7.0.0-1007.7
linux-image-oracle-7.0 –  7.0.0-1007.7
linux-image-raspi –  7.0.0-1014.14
linux-image-raspi-7.0 –  7.0.0-1014.14
linux-image-raspi-realtime –  7.0.0-1014.14
linux-image-raspi-realtime-7.0 –  7.0.0-1014.14
linux-image-realtime –  7.0.0-27.27.1
linux-image-realtime-64k –  7.0.0-27.27.1
linux-image-realtime-64k-7.0 –  7.0.0-27.27.1
linux-image-realtime-64k-hwe-26.04 –  7.0.0-27.27.1
linux-image-realtime-7.0 –  7.0.0-27.27.1
linux-image-realtime-hwe-26.04 –  7.0.0-27.27.1
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

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References

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