{
  "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-2026-52999",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-52999",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-06-24T16:29:11.757Z",
    "updatedAt": "2026-10-19T19:47:12.850Z",
    "importedAt": "2026-10-24T01:58:14.884Z",
    "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": "netfilter: nfnetlink_osf: fix out-of-bounds read on option matching",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_osf: fix out-of-bounds read on option matching\n\nIn nf_osf_match(), the nf_osf_hdr_ctx structure is initialized once\nand passed by reference to nf_osf_match_one() for each fingerprint\nchecked. During TCP option parsing, nf_osf_match_one() advances the\nshared ctx->optp pointer.\n\nIf a fingerprint perfectly matches, the function returns early without\nrestoring ctx->optp to its initial state. If the user has configured\nNF_OSF_LOGLEVEL_ALL, the loop continues to the next fingerprint.\nHowever, because ctx->optp was not restored, the next call to\nnf_osf_match_one() starts parsing from the end of the options buffer.\nThis causes subsequent matches to read garbage data and fail\nimmediately, making it impossible to log more than one match or logging\nincorrect matches.\n\nInstead of using a shared ctx->optp pointer, pass the context as a\nconstant pointer and use a local pointer (optp) for TCP option\ntraversal. This makes nf_osf_match_one() strictly stateless from the\ncaller's perspective, ensuring every fingerprint check starts at the\ncorrect option offset.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0145548346c4a30981a870a8ca00eac46ba27e85"
            },
            {
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1c136f2c44a5913646bac85303612fd0825197a0"
            },
            {
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1e19a07291bb8682c14c39a64725a3ae54ab8ccc"
            },
            {
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "32e50f92c7cf3f4eba29622179a5fcdc2aebab41"
            },
            {
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "70a3f31d25cf2ec9d4ddfa408120171ead955623"
            },
            {
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "21883587593d7c8bb519a79460a0b5bc5ffbdabd"
            },
            {
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "edb78a142d2e5948e63647c0646aa7e7886935f0"
            },
            {
              "version": "1a6a0951fc009f6d9fe8ebea2d2417d80d54097b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f5ca450087c3baf3651055e7a6de92600f827af3"
            },
            {
              "version": "0c1054e0e5fdef2369fb089e94def978bd209e1f",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "8316b60582facd4068fb0916c4db2418c21b7174",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "4.19.26",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.20"
            },
            {
              "version": "4.20.13",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.21"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.0",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.0"
            },
            {
              "version": "5.10.258",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.209",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.175",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.141",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.91",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.33",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.0.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}