net/sched: fix use-after-free in __tcf_action_put()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99167
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 11:17:37 UTC
Updated2026-10-31 13:17:58 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001830000 probability, percentile 0.079290000 (date 2026-10-31)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 16af6067392c40e454e49eec834843ab03643d96 4d83a3fc03bc595dd39b79ad61288738fbb1f2ba git Not specified
CNA Linux Linux affected 16af6067392c40e454e49eec834843ab03643d96 fd01abed2568209f7daaf60e5ee68ae4a4744f48 git Not specified
CNA Linux Linux affected 16af6067392c40e454e49eec834843ab03643d96 fcc7d734ceccfab8ec3398c5b34f8e775d459507 git Not specified
CNA Linux Linux affected 16af6067392c40e454e49eec834843ab03643d96 fde33eb9955d819af282d5f5e84684eaec248291 git Not specified
CNA Linux Linux affected 16af6067392c40e454e49eec834843ab03643d96 969ad6f2b266f383b44194d50d15631969b26222 git Not specified
CNA Linux Linux affected 16af6067392c40e454e49eec834843ab03643d96 2465d27ef90de9105c2bffb6c35f8ce08918e642 git Not specified
CNA Linux Linux affected 16af6067392c40e454e49eec834843ab03643d96 2e012e431aa271ef3c84206f48854f539c03bff0 git Not specified
CNA Linux Linux affected 16af6067392c40e454e49eec834843ab03643d96 7b16eb911091aae237a8673da94e4dfb9cd21d54 git Not specified
CNA Linux Linux affected 4.19 Not specified
CNA Linux Linux unaffected 4.19 semver Not specified
CNA Linux Linux unaffected 5.10.273 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.224 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.191 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.161 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.115 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.59 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.13 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4d83a3fc03bc595dd39b79ad61288738fbb1f2ba 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fcc7d734ceccfab8ec3398c5b34f8e775d459507 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2e012e431aa271ef3c84206f48854f539c03bff0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fd01abed2568209f7daaf60e5ee68ae4a4744f48 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2465d27ef90de9105c2bffb6c35f8ce08918e642 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/969ad6f2b266f383b44194d50d15631969b26222 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7b16eb911091aae237a8673da94e4dfb9cd21d54 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fde33eb9955d819af282d5f5e84684eaec248291 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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