Vulnerability-Lookup

GHSA-QQCV-H6XQ-MW7Q

Vulnerability from github – Published: 2026-03-25 12:30 – Updated: 2026-03-25 12:30

Details

In the Linux kernel, the following vulnerability has been resolved:

netfilter: xt_CT: drop pending enqueued packets on template removal

Templates refer to objects that can go away while packets are sitting in nfqueue refer to:

helper, this can be an issue on module removal.
timeout policy, nfnetlink_cttimeout might remove it.

The use of templates with zone and event cache filter are safe, since this just copies values.

Flush these enqueued packets in case the template rule gets removed.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23391"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-25T11:16:39Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_CT: drop pending enqueued packets on template removal\n\nTemplates refer to objects that can go away while packets are sitting in\nnfqueue refer to:\n\n- helper, this can be an issue on module removal.\n- timeout policy, nfnetlink_cttimeout might remove it.\n\nThe use of templates with zone and event cache filter are safe, since\nthis just copies values.\n\nFlush these enqueued packets in case the template rule gets removed.",
  "id": "GHSA-qqcv-h6xq-mw7q",
  "modified": "2026-03-25T12:30:24Z",
  "published": "2026-03-25T12:30:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23391"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/19a230dec6bb8928e3f96387f9085cf2c79bcef9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/63b8097cea1923fe82cd598068d0796da8c015ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/777d02efe3d630cca4c1b63962cec17c57711325"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb549925875fa06dd155e49db4ac2c5044c30f9c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2d0bae0c9a2a17b6990a2966f5cdce0813d6256"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f62a218a946b19bb59abdd5361da85fa4606b96b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-23391 (GCVE-0-2026-23391)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:33 – Updated: 2026-03-25 10:33

Title

netfilter: xt_CT: drop pending enqueued packets on template removal

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_CT: drop pending enqueued packets on template removal Templates refer to objects that can go away while packets are sitting in nfqueue refer to: - helper, this can be an issue on module removal. - timeout policy, nfnetlink_cttimeout might remove it. The use of templates with zone and event cache filter are safe, since this just copies values. Flush these enqueued packets in case the template rule gets removed.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/d2d0bae0c9a2a17b6…
	https://git.kernel.org/stable/c/63b8097cea1923fe8…
	https://git.kernel.org/stable/c/19a230dec6bb8928e…
	https://git.kernel.org/stable/c/cb549925875fa06dd…
	https://git.kernel.org/stable/c/777d02efe3d630cca…
	https://git.kernel.org/stable/c/f62a218a946b19bb5…

Impacted products

Vendor

Product

Version

Linux

Affected: 24de58f465165298aaa8f286b2592f0163706cfe , < d2d0bae0c9a2a17b6990a2966f5cdce0813d6256 (git)
Affected: 24de58f465165298aaa8f286b2592f0163706cfe , < 63b8097cea1923fe82cd598068d0796da8c015ec (git)
Affected: 24de58f465165298aaa8f286b2592f0163706cfe , < 19a230dec6bb8928e3f96387f9085cf2c79bcef9 (git)
Affected: 24de58f465165298aaa8f286b2592f0163706cfe , < cb549925875fa06dd155e49db4ac2c5044c30f9c (git)
Affected: 24de58f465165298aaa8f286b2592f0163706cfe , < 777d02efe3d630cca4c1b63962cec17c57711325 (git)
Affected: 24de58f465165298aaa8f286b2592f0163706cfe , < f62a218a946b19bb59abdd5361da85fa4606b96b (git)

Linux

Affected: 3.4
Unaffected: 0 , < 3.4 (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc5 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/xt_CT.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "24de58f465165298aaa8f286b2592f0163706cfe",
              "versionType": "git"
            },
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              "versionType": "git"
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          ]
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        {
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.4"
            },
            {
              "lessThan": "3.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.20",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0-rc5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "versionEndExcluding": "6.1.167",
                  "versionStartIncluding": "3.4",
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                },
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_CT: drop pending enqueued packets on template removal\n\nTemplates refer to objects that can go away while packets are sitting in\nnfqueue refer to:\n\n- helper, this can be an issue on module removal.\n- timeout policy, nfnetlink_cttimeout might remove it.\n\nThe use of templates with zone and event cache filter are safe, since\nthis just copies values.\n\nFlush these enqueued packets in case the template rule gets removed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T10:33:15.677Z",
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        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/63b8097cea1923fe82cd598068d0796da8c015ec"
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          "url": "https://git.kernel.org/stable/c/777d02efe3d630cca4c1b63962cec17c57711325"
        },
        {
          "url": "https://git.kernel.org/stable/c/f62a218a946b19bb59abdd5361da85fa4606b96b"
        }
      ],
      "title": "netfilter: xt_CT: drop pending enqueued packets on template removal",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23391",
    "datePublished": "2026-03-25T10:33:15.677Z",
    "dateReserved": "2026-01-13T15:37:46.009Z",
    "dateUpdated": "2026-03-25T10:33:15.677Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date

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-QQCV-H6XQ-MW7Q

CVE-2026-23391 (GCVE-0-2026-23391)

Tags

Sightings

Nomenclature