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A vulnerability in the Linux kernel related to the audit subsystem was resolved. The issue involved the fchmodat2() system call, introduced in version 6.6, which was not properly included in the audit's change attribute class. This omission allowed changes to file attributes via fchmodat2() to bypass audit rules. The vulnerability affects numerous Linux kernel versions and was addressed by adding fchmodat2() to the audit change attributes class. The fix is included in updated Linux kernel packages released by Ubuntu. Users are advised to update their systems and reboot to apply the patches. Due to an ABI change, recompilation of third-party kernel modules may be necessary. The overall severity is medium with a CVSS score of 5.5.

The Linux kernel vulnerability CVE-2025-71239 concerns the audit subsystem's failure to include the fchmodat2() system call, introduced in kernel version 6.6, in the change attribute class. This allowed file attribute changes made via fchmodat2() to bypass audit rules that monitor such changes, potentially evading security monitoring. The issue was fixed by updating the audit subsystem to recognize fchmodat2() as part of the change attributes class. The fix is available in Linux kernel updates distributed by Ubuntu, covering a wide range of kernel versions and architectures. The updates require a system reboot and recompilation of third-party kernel modules due to ABI changes. The vulnerability has a CVSS 3.1 score of 5.5 (medium severity), with no known exploits in the wild at the time of publication.

Detailed information about UBUNTU-CVE-2025-71239 affecting null linux. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2025-71239 - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: audit: add fchmodat2() to change attributes class fchmodat2(), introduced in… (CVE-2025-71239)

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