1. Ubuntu Security Notices
  2. USN-7653-1

USN-7653-1: Linux kernel (HWE) vulnerabilities

Publication date

17 July 2025

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that the CIFS network file system implementation in the
Linux kernel did not properly verify the target namespace when handling
upcalls. An attacker could use this to expose sensitive information.
(CVE-2025-2312)

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:

  • PowerPC architecture;
  • S390 architecture;
  • Block layer subsystem;
  • Serial ATA and Parallel ATA drivers;
  • Drivers core;
  • Network block device driver;
  • Character device driver;
  • TPM device driver;
  • Clock framework and drivers;
  • FireWire subsystem;
  • GPIO subsystem;
  • GPU drivers;
  • HID subsystem;
  • I3C subsystem;
  • InfiniBand drivers;
  • IOMMU subsystem;
  • IRQ chip...

It was discovered that the CIFS network file system implementation in the
Linux kernel did not properly verify the target namespace when handling
upcalls. An attacker could use this to expose sensitive information.
(CVE-2025-2312)

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:

  • PowerPC architecture;
  • S390 architecture;
  • Block layer subsystem;
  • Serial ATA and Parallel ATA drivers;
  • Drivers core;
  • Network block device driver;
  • Character device driver;
  • TPM device driver;
  • Clock framework and drivers;
  • FireWire subsystem;
  • GPIO subsystem;
  • GPU drivers;
  • HID subsystem;
  • I3C subsystem;
  • InfiniBand drivers;
  • IOMMU subsystem;
  • IRQ chip drivers;
  • Media drivers;
  • NVIDIA Tegra memory controller driver;
  • Fastrpc Driver;
  • Network drivers;
  • Mellanox network drivers;
  • Operating Performance Points (OPP) driver;
  • PCI subsystem;
  • x86 platform drivers;
  • i.MX PM domains;
  • PPS (Pulse Per Second) driver;
  • PTP clock framework;
  • Remote Processor subsystem;
  • Real Time Clock drivers;
  • SCSI subsystem;
  • QCOM SoC drivers;
  • Media staging drivers;
  • TTY drivers;
  • UFS subsystem;
  • USB Gadget drivers;
  • USB Host Controller drivers;
  • USB Serial drivers;
  • AFS file system;
  • File systems infrastructure;
  • BTRFS file system;
  • F2FS file system;
  • GFS2 file system;
  • NILFS2 file system;
  • File system notification infrastructure;
  • Overlay file system;
  • Proc file system;
  • SMB network file system;
  • UBI file system;
  • Timer subsystem;
  • KVM subsystem;
  • Networking core;
  • ptr_ring data structure definitions;
  • Networking subsytem;
  • Amateur Radio drivers;
  • XFRM subsystem;
  • Tracing infrastructure;
  • BPF subsystem;
  • Kernel CPU control infrastructure;
  • Padata parallel execution mechanism;
  • printk logging mechanism;
  • Memory management;
  • Bluetooth subsystem;
  • DCCP (Datagram Congestion Control Protocol);
  • IPv4 networking;
  • IPv6 networking;
  • MAC80211 subsystem;
  • IEEE 802.15.4 subsystem;
  • Multipath TCP;
  • Netfilter;
  • NFC subsystem;
  • Open vSwitch;
  • Rose network layer;
  • RxRPC session sockets;
  • Network traffic control;
  • VMware vSockets driver;
  • Landlock security;
  • Linux Security Modules (LSM) Framework;
  • Tomoyo security module;
  • SoC audio core drivers

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 jammy linux-image-6.8.0-64-generic –  6.8.0-64.67~22.04.1
linux-image-6.8.0-64-generic-64k –  6.8.0-64.67~22.04.1
linux-image-generic-6.8 –  6.8.0-64.67~22.04.1
linux-image-generic-64k-6.8 –  6.8.0-64.67~22.04.1
linux-image-generic-64k-hwe-22.04 –  6.8.0-64.67~22.04.1
linux-image-generic-hwe-22.04 –  6.8.0-64.67~22.04.1
linux-image-oem-22.04 –  6.8.0-64.67~22.04.1
linux-image-oem-22.04a –  6.8.0-64.67~22.04.1
linux-image-oem-22.04b –  6.8.0-64.67~22.04.1
linux-image-oem-22.04c –  6.8.0-64.67~22.04.1
linux-image-oem-22.04d –  6.8.0-64.67~22.04.1
linux-image-virtual-6.8 –  6.8.0-64.67~22.04.1
linux-image-virtual-hwe-22.04 –  6.8.0-64.67~22.04.1

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References

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