CVE-2026-53236 (GCVE-0-2026-53236)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI
Title
tcp: restrict SO_ATTACH_FILTER to priv users
Summary
In the Linux kernel, the following vulnerability has been resolved: tcp: restrict SO_ATTACH_FILTER to priv users This patch restricts the use of SO_ATTACH_FILTER (cBPF) on TCP sockets to users with CAP_NET_ADMIN capability. This blocks potential side-channel attack where an unprivileged application attaches a filter to leak TCP sequence/acknowledgment numbers.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3747de241a66ef2c7032d2cc2b826a47c5fa0f6a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 82b3e7ce10c53fc12aab8904745603efc74f8c07 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ede69b8f6670600e534591664584f810d7c385f9 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c68517a3e18e20997808821c5559d0cba4d776c1 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5d39580f68e6ddeedd15e587282207489dfb3da2 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (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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      ],
      "cpeApplicability": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: restrict SO_ATTACH_FILTER to priv users\n\nThis patch restricts the use of SO_ATTACH_FILTER (cBPF) on TCP sockets\nto users with CAP_NET_ADMIN capability.\n\nThis blocks potential side-channel attack where an unprivileged application\nattaches a filter to leak TCP sequence/acknowledgment numbers."
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      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:39:33.170Z",
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    "dateReserved": "2026-06-09T07:44:35.393Z",
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  }
}


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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

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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.