{
  "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-2026-43233",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-43233",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-05-06T11:28:29.565Z",
    "updatedAt": "2026-10-19T19:16:24.877Z",
    "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: nf_conntrack_h323: fix OOB read in decode_choice()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_h323: fix OOB read in decode_choice()\n\nIn decode_choice(), the boundary check before get_len() uses the\nvariable `len`, which is still 0 from its initialization at the top of\nthe function:\n\n    unsigned int type, ext, len = 0;\n    ...\n    if (ext || (son->attr & OPEN)) {\n        BYTE_ALIGN(bs);\n        if (nf_h323_error_boundary(bs, len, 0))  /* len is 0 here */\n            return H323_ERROR_BOUND;\n        len = get_len(bs);                        /* OOB read */\n\nWhen the bitstream is exactly consumed (bs->cur == bs->end), the check\nnf_h323_error_boundary(bs, 0, 0) evaluates to (bs->cur + 0 > bs->end),\nwhich is false.  The subsequent get_len() call then dereferences\n*bs->cur++, reading 1 byte past the end of the buffer.  If that byte\nhas bit 7 set, get_len() reads a second byte as well.\n\nThis can be triggered remotely by sending a crafted Q.931 SETUP message\nwith a User-User Information Element containing exactly 2 bytes of\nPER-encoded data ({0x08, 0x00}) to port 1720 through a firewall with\nthe nf_conntrack_h323 helper active.  The decoder fully consumes the\nPER buffer before reaching this code path, resulting in a 1-2 byte\nheap-buffer-overflow read confirmed by AddressSanitizer.\n\nFix this by checking for 2 bytes (the maximum that get_len() may read)\ninstead of the uninitialized `len`.  This matches the pattern used at\nevery other get_len() call site in the same file, where the caller\nchecks for 2 bytes of available data before calling get_len().",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa",
              "status": "affected",
              "versionType": "git",
              "lessThan": "bcb50aa0b8f2b74a9fe5a1c7bee6f2657a288041"
            },
            {
              "version": "ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2a3aac4205e7d2f1aca2e3827de8cdd517d36c4a"
            },
            {
              "version": "ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa",
              "status": "affected",
              "versionType": "git",
              "lessThan": "81f2fc5b0d0cf4696146f00f837596d10b92dead"
            },
            {
              "version": "ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7ef82863d42261817a6394c6c881bd6757a70f16"
            },
            {
              "version": "ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa",
              "status": "affected",
              "versionType": "git",
              "lessThan": "53d32735d77ab56cc3fc7bd53a7d099418f19be1"
            },
            {
              "version": "ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f0a83d0a4b7c127d32ac06d607a9214937716129"
            },
            {
              "version": "ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa",
              "status": "affected",
              "versionType": "git",
              "lessThan": "35f1943d242e1b9f0b6e91c0c93bfb293a9f8224"
            },
            {
              "version": "ec8a8f3c31ddef0a7d9626c4b8a4baa30f3b80aa",
              "status": "affected",
              "versionType": "git",
              "lessThan": "baed0d9ba91d4f390da12d5039128ee897253d60"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.15",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.15"
            },
            {
              "version": "5.10.252",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.202",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.165",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.128",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.75",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.16",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "6.19.6",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "version": "7.0",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}