1. Ubuntu Security Notices
  2. USN-7879-4

USN-7879-4: Linux kernel vulnerabilities

Publication date

4 December 2025

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that improper initialization of CPU cache memory could
allow a local attacker with hypervisor access to overwrite SEV-SNP guest
memory resulting in loss of data integrity. (CVE-2024-36331)

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;
  • PowerPC architecture;
  • S390 architecture;
  • x86 architecture;
  • Network block device driver;
  • Character device driver;
  • Clock framework and drivers;
  • Data acquisition framework and drivers;
  • Hardware crypto device drivers;
  • Device frequency scaling framework;
  • DMA engine subsystem;
  • EDAC drivers;
  • GPU drivers;
  • HID subsystem;
  • Hardware monitoring drivers;
  • I2C subsystem;
  • IIO...

It was discovered that improper initialization of CPU cache memory could
allow a local attacker with hypervisor access to overwrite SEV-SNP guest
memory resulting in loss of data integrity. (CVE-2024-36331)

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;
  • PowerPC architecture;
  • S390 architecture;
  • x86 architecture;
  • Network block device driver;
  • Character device driver;
  • Clock framework and drivers;
  • Data acquisition framework and drivers;
  • Hardware crypto device drivers;
  • Device frequency scaling framework;
  • DMA engine subsystem;
  • EDAC drivers;
  • GPU drivers;
  • HID subsystem;
  • Hardware monitoring drivers;
  • I2C subsystem;
  • IIO subsystem;
  • IIO ADC drivers;
  • InfiniBand drivers;
  • Input Device core drivers;
  • Multiple devices driver;
  • Media drivers;
  • Network drivers;
  • Mellanox network drivers;
  • PCI subsystem;
  • PHY drivers;
  • Pin controllers subsystem;
  • x86 platform drivers;
  • Power supply drivers;
  • Powercap sysfs driver;
  • Voltage and Current Regulator drivers;
  • S/390 drivers;
  • ASPEED SoC drivers;
  • SPI subsystem;
  • small TFT LCD display modules;
  • Media staging drivers;
  • USB Gadget drivers;
  • vDPA drivers;
  • VFIO drivers;
  • Framebuffer layer;
  • Xen hypervisor drivers;
  • BTRFS file system;
  • Ceph distributed file system;
  • EFI Variable file system;
  • File systems infrastructure;
  • F2FS file system;
  • GFS2 file system;
  • Network file systems library;
  • Network file system (NFS) client;
  • Network file system (NFS) server daemon;
  • NILFS2 file system;
  • NTFS3 file system;
  • Proc file system;
  • SMB network file system;
  • DRM display driver;
  • io_uring subsystem;
  • Internal shared memory driver;
  • padata parallel execution mechanism;
  • Networking subsytem;
  • Bluetooth subsystem;
  • Netfilter;
  • UDP network protocol;
  • Tracing infrastructure;
  • BPF subsystem;
  • Perf events;
  • Padata parallel execution mechanism;
  • Codetag library;
  • KASAN memory debugging framework;
  • Memory management;
  • 802.1Q VLAN protocol;
  • Appletalk network protocol;
  • Asynchronous Transfer Mode (ATM) subsystem;
  • Networking core;
  • IPv4 networking;
  • IPv6 networking;
  • MAC80211 subsystem;
  • Multipath TCP;
  • Netlink;
  • RxRPC session sockets;
  • Network traffic control;
  • SMC sockets;
  • Sun RPC protocol;
  • TIPC protocol;
  • TLS protocol;
  • VMware vSockets driver;
  • Wireless networking;
  • XFRM subsystem;
  • ADI SoundPort AD1816A based soundcard drivers;
  • MediaTek ASoC drivers;
  • SOF drivers;
  • USB sound devices;
  • 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
25.04 plucky linux-image-6.14.0-1018-raspi –  6.14.0-1018.18
linux-image-raspi –  6.14.0-1018.18
linux-image-raspi-6.14 –  6.14.0-1018.18
24.04 LTS noble linux-image-6.14.0-1020-gcp –  6.14.0-1020.21~24.04.1
linux-image-6.14.0-1020-gcp-64k –  6.14.0-1020.21~24.04.1
linux-image-gcp –  6.14.0-1020.21~24.04.1
linux-image-gcp-6.14 –  6.14.0-1020.21~24.04.1
linux-image-gcp-64k –  6.14.0-1020.21~24.04.1
linux-image-gcp-64k-6.14 –  6.14.0-1020.21~24.04.1

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References

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