Vulnerability-Lookup

GHSA-JMMV-2HP7-P7G5

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:

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53236"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T09:16:41Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-jmmv-2hp7-p7g5",
  "modified": "2026-06-25T09:31:22Z",
  "published": "2026-06-25T09:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53236"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3747de241a66ef2c7032d2cc2b826a47c5fa0f6a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d39580f68e6ddeedd15e587282207489dfb3da2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82b3e7ce10c53fc12aab8904745603efc74f8c07"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c68517a3e18e20997808821c5559d0cba4d776c1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ede69b8f6670600e534591664584f810d7c385f9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

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

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

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/3747de241a66ef2c7…
https://git.kernel.org/stable/c/ecfe9171b26ae3eed…
https://git.kernel.org/stable/c/82b3e7ce10c53fc12…
https://git.kernel.org/stable/c/ede69b8f6670600e5…
https://git.kernel.org/stable/c/c68517a3e18e20997…
https://git.kernel.org/stable/c/5d39580f68e6ddeed…

Impacted products

2 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)
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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
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              "versionType": "git"
            },
            {
              "lessThan": "c68517a3e18e20997808821c5559d0cba4d776c1",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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                }
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          "lang": "en",
          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:39:33.170Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba"
        },
        {
          "url": "https://git.kernel.org/stable/c/82b3e7ce10c53fc12aab8904745603efc74f8c07"
        },
        {
          "url": "https://git.kernel.org/stable/c/ede69b8f6670600e534591664584f810d7c385f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/c68517a3e18e20997808821c5559d0cba4d776c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d39580f68e6ddeedd15e587282207489dfb3da2"
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      ],
      "title": "tcp: restrict SO_ATTACH_FILTER to priv users",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53236",
    "datePublished": "2026-06-25T08:39:33.170Z",
    "dateReserved": "2026-06-09T07:44:35.393Z",
    "dateUpdated": "2026-06-25T08:39:33.170Z",
    "state": "PUBLISHED"
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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-JMMV-2HP7-P7G5

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

Tags

Sightings

Nomenclature