CVE-2026-53269 (GCVE-0-2026-53269)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI
Title
netfilter: synproxy: add mutex to guard hook reference counting
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ad49d86e07a497e834cb06f2b151dccd75f8e148 , < 0ec9ddc1bda261a2c57636c74c8b4e53000102c9 (git)
Affected: ad49d86e07a497e834cb06f2b151dccd75f8e148 , < 56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389 (git)
Affected: ad49d86e07a497e834cb06f2b151dccd75f8e148 , < debc57b83d5b323df74bf010c8d50fe26ad2ed6b (git)
Affected: ad49d86e07a497e834cb06f2b151dccd75f8e148 , < 0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88 (git)
Affected: ad49d86e07a497e834cb06f2b151dccd75f8e148 , < 640441348258220e78daed40528b85b8afcedab6 (git)
Affected: ad49d86e07a497e834cb06f2b151dccd75f8e148 , < aaf80701dc2f7a48fe543961e21f8ca3924d587c (git)
Affected: ad49d86e07a497e834cb06f2b151dccd75f8e148 , < fbf0591275f50eae5733c3d7a8cd6c1e79933ffa (git)
Affected: ad49d86e07a497e834cb06f2b151dccd75f8e148 , < 2fcba19caaeb2a33017459d3430f057967bb91b6 (git)
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Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "net/netfilter/nf_synproxy_core.c"
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      "cpeApplicability": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: synproxy: add mutex to guard hook reference counting\n\nAs the synproxy infrastructure register netfilter hooks on-demand when a\nuser adds the first iptables target or nftables expression, if done\nconcurrently they can race each other.\n\nIntroduce a mutex to serialize the refcount control blocks access from\nboth frontends. While a per namespace mutex might be more efficient, it\nis not needed for target/expression like SYNPROXY."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:39:55.172Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2026-53269",
    "datePublished": "2026-06-25T08:39:55.172Z",
    "dateReserved": "2026-06-09T07:44:35.395Z",
    "dateUpdated": "2026-06-25T08:39:55.172Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-07-02",
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      "percentile": "0.06811"
    },
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  }
}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.