Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: net/sched: fix use-after-free in __tcf_action_put() __tcf_action_put() decrements the reference count before decrementing the binding count. Another thread can free the action between these operations, causing the binding-count update to access freed memory. KASAN reports it as: BUG: KASAN: slab-use-after-free in __tcf_action_put+0x327/0x340 Write of size 4 at addr ff11000000d46420 by task tc-put-pause/64 Hold the action IDR mutex across both counter updates and IDR removal, keeping cleanup outside the lock.

[ 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-Bund28 Oct 2026WID-SEC-2026-4224

  Linux Kernel: Multiple vulnerabilities allow an unspecified attack Translated from German

  CVE-2026-99116CVE-2026-99143CVE-2026-99170+113 more CVEs

[ References ]References

• git.kernel.org/stable/c/2465d27ef90de9105c2bffb6c35f8ce08918e642
• git.kernel.org/stable/c/2e012e431aa271ef3c84206f48854f539c03bff0
• git.kernel.org/stable/c/4d83a3fc03bc595dd39b79ad61288738fbb1f2ba
• git.kernel.org/stable/c/7b16eb911091aae237a8673da94e4dfb9cd21d54
• git.kernel.org/stable/c/969ad6f2b266f383b44194d50d15631969b26222
• git.kernel.org/stable/c/fcc7d734ceccfab8ec3398c5b34f8e775d459507
• git.kernel.org/stable/c/fd01abed2568209f7daaf60e5ee68ae4a4744f48
• git.kernel.org/stable/c/fde33eb9955d819af282d5f5e84684eaec248291