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.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

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

Configurations

No configuration.

History

31 Oct 2026, 13:17

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.8

30 Oct 2026, 13:21

Type	Values Removed	Values Added
References		() https://git.kernel.org/stable/c/4d83a3fc03bc595dd39b79ad61288738fbb1f2ba - () https://git.kernel.org/stable/c/969ad6f2b266f383b44194d50d15631969b26222 - () https://git.kernel.org/stable/c/fcc7d734ceccfab8ec3398c5b34f8e775d459507 - () https://git.kernel.org/stable/c/fd01abed2568209f7daaf60e5ee68ae4a4744f48 - () https://git.kernel.org/stable/c/fde33eb9955d819af282d5f5e84684eaec248291 -

28 Oct 2026, 11:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-28 11:17

Updated : 2026-10-31 13:17

NVD link : CVE-2026-99167

Mitre link : CVE-2026-99167

CVE.ORG link : CVE-2026-99167

JSON object : View

Products Affected

No product.

CWE

No CWE.

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Another thread can free the action between these operations,\ncausing the binding-count update to access freed memory. KASAN reports it\nas:\n\n BUG: KASAN: slab-use-after-free in __tcf_action_put+0x327/0x340\n Write of size 4 at addr ff11000000d46420 by task tc-put-pause/64\n\nHold the action IDR mutex across both counter updates and IDR removal,\nkeeping cleanup outside the lock."}], "lastModified": "2026-10-31T13:17:58.417", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}