In 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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
ad49d86e07a497e834cb06f2b151dccd75f8e148 affected < 0ec9ddc1bda261a2c57636c74c8b4e53000102c9
ad49d86e07a497e834cb06f2b151dccd75f8e148 affected < 56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389
ad49d86e07a497e834cb06f2b151dccd75f8e148 affected < debc57b83d5b323df74bf010c8d50fe26ad2ed6b
ad49d86e07a497e834cb06f2b151dccd75f8e148 affected < 0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88
ad49d86e07a497e834cb06f2b151dccd75f8e148 affected < 640441348258220e78daed40528b85b8afcedab6
ad49d86e07a497e834cb06f2b151dccd75f8e148 affected < aaf80701dc2f7a48fe543961e21f8ca3924d587c
ad49d86e07a497e834cb06f2b151dccd75f8e148 affected < fbf0591275f50eae5733c3d7a8cd6c1e79933ffa
ad49d86e07a497e834cb06f2b151dccd75f8e148 affected < 2fcba19caaeb2a33017459d3430f057967bb91b6
Linux Linux affected
Version Status Constraints
5.3 affected —
0 unaffected < 5.3
5.10.259 unaffected ≤ 5.10.*
5.15.210 unaffected ≤ 5.15.*
6.1.176 unaffected ≤ 6.1.*
6.6.143 unaffected ≤ 6.6.*
6.12.94 unaffected ≤ 6.12.*
6.18.36 unaffected ≤ 6.18.*
7.0.13 unaffected ≤ 7.0.*
7.1 unaffected ≤ *

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/0ec9ddc1bda261a2c57636c74c8b4e53000102c9 cve-icon
https://git.kernel.org/stable/c/0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88 cve-icon
https://git.kernel.org/stable/c/2fcba19caaeb2a33017459d3430f057967bb91b6 cve-icon
https://git.kernel.org/stable/c/56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389 cve-icon
https://git.kernel.org/stable/c/640441348258220e78daed40528b85b8afcedab6 cve-icon
https://git.kernel.org/stable/c/aaf80701dc2f7a48fe543961e21f8ca3924d587c cve-icon
https://git.kernel.org/stable/c/debc57b83d5b323df74bf010c8d50fe26ad2ed6b cve-icon
https://git.kernel.org/stable/c/fbf0591275f50eae5733c3d7a8cd6c1e79933ffa cve-icon
History

Thu, 25 Jun 2026 12:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-362

Thu, 25 Jun 2026 09:15:00 +0000

Type Values Removed Values Added
Description In 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.
Title netfilter: synproxy: add mutex to guard hook reference counting
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-06-25T08:39:55.172Z

Reserved: 2026-06-09T07:44:35.395Z

Link: CVE-2026-53269

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-25T11:45:03Z

Weaknesses