Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: IB/mlx4: Fix use-after-free on pkey sysfs registration failure register_pkey_tree() ignores errors from register_one_pkey_tree() and continues registering the remaining slaves. The per-slave error path has already released the pkey parent kobjects, but their pointers remain stored in the device. A later device cleanup therefore passes the stale pointers to kobject_put(), causing a use-after-free. Clear the parent pointers after releasing a failed slave tree and skip unregistered trees during device cleanup. This preserves the existing best-effort registration behavior while preventing a second cleanup of the failed tree.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund5 Oct 2026WID-SEC-2026-3743

  Linux Kernel: Multiple vulnerabilities Translated from German

  Risk mediumCVE-2026-98221CVE-2026-98181CVE-2026-98248+204 more CVEs

[ References ]References

• git.kernel.org/stable/c/0c3482e965b18bc242e54e899d1c4d391ca8e5e3
• git.kernel.org/stable/c/1af874e9f4ce22ccf8b10ab5462f32c70d3be21a
• git.kernel.org/stable/c/734f066933484f6c7cedea0312763249beed5845
• git.kernel.org/stable/c/791471421d848ce13e84f4b21c9e19973d471c4e
• git.kernel.org/stable/c/a07bee32127d7c4cd3b1bb9a088e21d0c93634c9
• git.kernel.org/stable/c/ced1186fea7c77e16681c7ef4802897885989c3b
• git.kernel.org/stable/c/cf20d7476754c00eec04ae23d3e929de33ce0345
• git.kernel.org/stable/c/ffb80872617b5f9b3dd1536ec2909029fa66f228