CVE-2026-99167

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.

Status

Received - 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-28

Last modified

2026-10-28

Affected products

• Linux Kernel (Linux)

References

• https://git.kernel.org/stable/c/2465d27ef90de9105c2bffb6c35f8ce08918e642
• https://git.kernel.org/stable/c/2e012e431aa271ef3c84206f48854f539c03bff0
• https://git.kernel.org/stable/c/7b16eb911091aae237a8673da94e4dfb9cd21d54