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netfilter: synproxy: add mutex to guard hook reference counting

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-53269

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-53269

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "ad49d86e07a497e834cb06f2b151dccd75f8e148",
        "lessThan": "0ec9ddc1bda261a2c57636c74c8b4e53000102c9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ad49d86e07a497e834cb06f2b151dccd75f8e148",
        "lessThan": "56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ad49d86e07a497e834cb06f2b151dccd75f8e148",
        "lessThan": "debc57b83d5b323df74bf010c8d50fe26ad2ed6b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ad49d86e07a497e834cb06f2b151dccd75f8e148",
        "lessThan": "0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ad49d86e07a497e834cb06f2b151dccd75f8e148",
        "lessThan": "640441348258220e78daed40528b85b8afcedab6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ad49d86e07a497e834cb06f2b151dccd75f8e148",
        "lessThan": "aaf80701dc2f7a48fe543961e21f8ca3924d587c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ad49d86e07a497e834cb06f2b151dccd75f8e148",
        "lessThan": "fbf0591275f50eae5733c3d7a8cd6c1e79933ffa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ad49d86e07a497e834cb06f2b151dccd75f8e148",
        "lessThan": "2fcba19caaeb2a33017459d3430f057967bb91b6",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_synproxy_core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.3"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.3",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.94",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.36",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_synproxy_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53269

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#28447 · Revision 1
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Publisher date
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