{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-23413",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-23413",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-04-02T11:40:54.384Z",
    "updatedAt": "2026-10-19T18:35:42.855Z",
    "importedAt": "2026-10-24T01:58:02.025Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "clsact: Fix use-after-free in init/destroy rollback asymmetry",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nclsact: Fix use-after-free in init/destroy rollback asymmetry\n\nFix a use-after-free in the clsact qdisc upon init/destroy rollback asymmetry.\nThe latter is achieved by first fully initializing a clsact instance, and\nthen in a second step having a replacement failure for the new clsact qdisc\ninstance. clsact_init() initializes ingress first and then takes care of the\negress part. This can fail midway, for example, via tcf_block_get_ext(). Upon\nfailure, the kernel will trigger the clsact_destroy() callback.\n\nCommit 1cb6f0bae504 (\"bpf: Fix too early release of tcx_entry\") details the\nway how the transition is happening. If tcf_block_get_ext on the q->ingress_block\nends up failing, we took the tcx_miniq_inc reference count on the ingress\nside, but not yet on the egress side. clsact_destroy() tests whether the\n{ingress,egress}_entry was non-NULL. However, even in midway failure on the\nreplacement, both are in fact non-NULL with a valid egress_entry from the\nprevious clsact instance.\n\nWhat we really need to test for is whether the qdisc instance-specific ingress\nor egress side previously got initialized. This adds a small helper for checking\nthe miniq initialization called mini_qdisc_pair_inited, and utilizes that upon\nclsact_destroy() in order to fix the use-after-free scenario. Convert the\ningress_destroy() side as well so both are consistent to each other.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "230bb13650b0f186f540500fd5f5f7096a822a2a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a73d95b57bf9faebdfed591bcb7ed9292062a84c"
            },
            {
              "version": "1cb6f0bae50441f4b4b32a28315853b279c7404e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "37bef86e5428d59f70a4da82b80f9a8f252fecbe"
            },
            {
              "version": "1cb6f0bae50441f4b4b32a28315853b279c7404e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4c9af67f99aa3e51b522c54968ab3ac8272be41c"
            },
            {
              "version": "1cb6f0bae50441f4b4b32a28315853b279c7404e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0509b762bc5e8ea7b8391130730c6d8502fc6e69"
            },
            {
              "version": "1cb6f0bae50441f4b4b32a28315853b279c7404e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a0671125d4f55e1e98d9bde8a0b671941987e208"
            },
            {
              "version": "f61ecf1bd5b562ebfd7d430ccb31619857e80857",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "6.6.41",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.6.130"
            },
            {
              "version": "6.9.10",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.10"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.10",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.10"
            },
            {
              "version": "6.6.130",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.78",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.20",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "6.19.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "version": "7.0",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}