netfilter: synproxy: add mutex to guard hook reference counting

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53269
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:45 UTC
Updated2026-07-08 04:01:49 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: synproxy: add mutex to guard hook reference counting As the synproxy infrastructure register netfilter hooks on-demand when a user adds the first iptables target or nftables expression, if done concurrently they can race each other. Introduce a mutex to serialize the refcount control blocks access from both frontends. While a per namespace mutex might be more efficient, it is not needed for target/expression like SYNPROXY.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.001720000 probability, percentile 0.068020000 (date 2026-07-04)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ad49d86e07a497e834cb06f2b151dccd75f8e148 0ec9ddc1bda261a2c57636c74c8b4e53000102c9 git Not specified
CNA Linux Linux affected ad49d86e07a497e834cb06f2b151dccd75f8e148 56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389 git Not specified
CNA Linux Linux affected ad49d86e07a497e834cb06f2b151dccd75f8e148 debc57b83d5b323df74bf010c8d50fe26ad2ed6b git Not specified
CNA Linux Linux affected ad49d86e07a497e834cb06f2b151dccd75f8e148 0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88 git Not specified
CNA Linux Linux affected ad49d86e07a497e834cb06f2b151dccd75f8e148 640441348258220e78daed40528b85b8afcedab6 git Not specified
CNA Linux Linux affected ad49d86e07a497e834cb06f2b151dccd75f8e148 aaf80701dc2f7a48fe543961e21f8ca3924d587c git Not specified
CNA Linux Linux affected ad49d86e07a497e834cb06f2b151dccd75f8e148 fbf0591275f50eae5733c3d7a8cd6c1e79933ffa git Not specified
CNA Linux Linux affected ad49d86e07a497e834cb06f2b151dccd75f8e148 2fcba19caaeb2a33017459d3430f057967bb91b6 git Not specified
CNA Linux Linux affected 5.3 Not specified
CNA Linux Linux unaffected 5.3 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0ec9ddc1bda261a2c57636c74c8b4e53000102c9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fbf0591275f50eae5733c3d7a8cd6c1e79933ffa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2fcba19caaeb2a33017459d3430f057967bb91b6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/debc57b83d5b323df74bf010c8d50fe26ad2ed6b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/aaf80701dc2f7a48fe543961e21f8ca3924d587c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/640441348258220e78daed40528b85b8afcedab6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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