{
  "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-2026-64089",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-64089",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-07-19T15:39:58.729Z",
    "updatedAt": "2026-08-05T12:39:06.132Z",
    "importedAt": "2026-10-24T01:58:25.636Z",
    "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": "batman-adv: tt: fix negative last_changeset_len",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: fix negative last_changeset_len\n\nbatadv_piv_tt::last_changeset_len len was declared as s16, but the field is\nnever intended to hold a negative value. When a value greater than 32767 is\nassigned, it wraps to a negative signed integer.\n\nIn batadv_send_my_tt_response(), last_changeset_len is temporarily widened\nto s32. The incorrectly negative s16 value propagates into the s32, causing\nbatadv_tt_prepare_tvlv_local_data() to allocate a full sized buffer but\npopulates only a small portion of it with the collected changeset. All\nremaining bits are kept uninitialized.\n\nUsing an u16 avoids this type confusion and ensures that no (negative) sign\nextension is performed in batadv_send_my_tt_response().",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6314089acf0ddf64376fdc0b1420695504c73f52"
            },
            {
              "version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "55dc41fe8821e9a849e147255ad572bc933a9d15"
            },
            {
              "version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c424e8519ac78eac5d9f4eecf06208a0d619ec14"
            },
            {
              "version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "22d59c72f4a47ffec121d0610f70d0d70c3c11c8"
            },
            {
              "version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "eb235472b52ef36981c5aad330485eaf2382c53b"
            },
            {
              "version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "179eb62506a02d00370bd6478898cb632e10986c"
            },
            {
              "version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d29abf70c665730e249d2ec8e1402095ae26bcee"
            },
            {
              "version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "fc92cdfcb295cefa4344d71a527d61b638b7bfc4"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.1",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.1"
            },
            {
              "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": "6.6.142",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.92",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.34",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.0.11",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}