Vulnerability-Lookup

GHSA-7M9Q-85QJ-RC4G

Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-06-25 09:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53269"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T09:16:45Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-7m9q-85qj-rc4g",
  "modified": "2026-06-25T09:31:23Z",
  "published": "2026-06-25T09:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53269"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ec9ddc1bda261a2c57636c74c8b4e53000102c9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2fcba19caaeb2a33017459d3430f057967bb91b6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/640441348258220e78daed40528b85b8afcedab6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aaf80701dc2f7a48fe543961e21f8ca3924d587c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/debc57b83d5b323df74bf010c8d50fe26ad2ed6b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbf0591275f50eae5733c3d7a8cd6c1e79933ffa"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39

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

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/0ec9ddc1bda261a2c…
https://git.kernel.org/stable/c/56ffbe3a08c01dcdb…
https://git.kernel.org/stable/c/debc57b83d5b323df…
https://git.kernel.org/stable/c/0f8ba5e4c53d2e4a5…
https://git.kernel.org/stable/c/640441348258220e7…
https://git.kernel.org/stable/c/aaf80701dc2f7a48f…
https://git.kernel.org/stable/c/fbf0591275f50eae5…
https://git.kernel.org/stable/c/2fcba19caaeb2a330…

Impacted products

2 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)
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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JSON

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{
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        {
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          "programFiles": [
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            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "version": "5.10.259",
              "versionType": "semver"
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.12.*",
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              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
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              "version": "7.1",
              "versionType": "original_commit_for_fix"
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    "datePublished": "2026-06-25T08:39:55.172Z",
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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.

Action not permitted

GHSA-7M9Q-85QJ-RC4G

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

Tags

Sightings

Nomenclature