{
  "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-2026-52993",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-52993",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-06-24T16:29:06.475Z",
    "updatedAt": "2026-10-19T19:47:12.544Z",
    "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": "tipc: fix double-free in tipc_buf_append()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix double-free in tipc_buf_append()\n\ntipc_msg_validate() can potentially reallocate the skb it is validating,\nfreeing the old one.  In tipc_buf_append(), it was being called with a\npointer to a local variable which was a copy of the caller's skb\npointer.\n\nIf the skb was reallocated and validation subsequently failed, the error\nhandling path would free the original skb pointer, which had already\nbeen freed, leading to double-free.\n\nFix this by checking if head now points to a newly allocated reassembled\nskb.  If it does, reassign *headbuf for later freeing operations.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a438975a6dcdbd70865978c021650d1485586f0b"
            },
            {
              "version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4ee4deadaae7cb2e3d53af0fc889cf92a73413c0"
            },
            {
              "version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d3556656c6daebf8def751c7e71d11dd0a180d24"
            },
            {
              "version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0274f24485fc38032d4093e463dc3ff5c7a667c9"
            },
            {
              "version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4d104882bc815d4ec666ace9155f5f52715879a6"
            },
            {
              "version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1d5e589055880fae229e229e1929e087dbe08cf3"
            },
            {
              "version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "29940fff14110ca48c5ccc168d121665b51bb778"
            },
            {
              "version": "d618d09a68e4eed7a435beb2e355250f6f40664a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.15",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.15"
            },
            {
              "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": "*"
            }
          ]
        }
      ]
    }
  }
}