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    },
    "description": {
      "data": "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().",
      "provider": "mitre"
    },
    "metrics": {
      "cvssV2_0": {
        "data": {},
        "provider": null
      },
      "cvssV3_0": {
        "data": {},
        "provider": null
      },
      "cvssV3_1": {
        "data": {
          "score": 9.8,
          "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        },
        "provider": "mitre"
      },
      "cvssV4_0": {
        "data": {},
        "provider": null
      },
      "epss": {
        "data": {
          "score": 0.00755
        },
        "provider": "first"
      },
      "kev": {
        "data": {},
        "provider": null
      },
      "ssvc": {
        "data": {},
        "provider": null
      },
      "threat_severity": {
        "data": null,
        "provider": "redhat"
      }
    },
    "references": {
      "data": [
        "https://git.kernel.org/stable/c/179eb62506a02d00370bd6478898cb632e10986c",
        "https://git.kernel.org/stable/c/22d59c72f4a47ffec121d0610f70d0d70c3c11c8",
        "https://git.kernel.org/stable/c/55dc41fe8821e9a849e147255ad572bc933a9d15",
        "https://git.kernel.org/stable/c/6314089acf0ddf64376fdc0b1420695504c73f52",
        "https://git.kernel.org/stable/c/c424e8519ac78eac5d9f4eecf06208a0d619ec14",
        "https://git.kernel.org/stable/c/d29abf70c665730e249d2ec8e1402095ae26bcee",
        "https://git.kernel.org/stable/c/eb235472b52ef36981c5aad330485eaf2382c53b",
        "https://git.kernel.org/stable/c/fc92cdfcb295cefa4344d71a527d61b638b7bfc4",
        "https://lore.kernel.org/linux-cve-announce/2026071917-CVE-2026-64089-321e@gregkh/T",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64089",
        "https://www.cve.org/CVERecord?id=CVE-2026-64089"
      ],
      "providers": [
        "mitre",
        "nvd",
        "redhat"
      ]
    },
    "title": {
      "data": "batman-adv: tt: fix negative last_changeset_len",
      "provider": "mitre"
    },
    "updated": {
      "data": "2026-08-11T15:33:55.310000+00:00",
      "provider": "nvd"
    },
    "vendors": {
      "data": [
        "linux",
        "linux$PRODUCT$linux_kernel"
      ],
      "providers": [
        "mitre",
        "nvd",
        "enrichment"
      ]
    },
    "weaknesses": {
      "data": [
        "CWE-190",
        "NVD-CWE-noinfo"
      ],
      "providers": [
        "nvd",
        "redhat"
      ]
    }
  },
  "redhat": {
    "cpes": [],
    "created": "2026-07-19T00:00:00+00:00",
    "description": "A flaw was found in the Linux kernel's batman-adv module. An integer overflow vulnerability in the last_changeset_len field can cause it to become a negative value. This leads to a buffer being improperly initialized, potentially exposing sensitive information. A local attacker could exploit this to achieve information disclosure.",
    "metrics": {
      "cvssV2_0": {},
      "cvssV3_0": {},
      "cvssV3_1": {},
      "threat_severity": null
    },
    "redhat_repo_path": "2026/CVE-2026-64089.json",
    "references": [
      "https://lore.kernel.org/linux-cve-announce/2026071917-CVE-2026-64089-321e@gregkh/T",
      "https://nvd.nist.gov/vuln/detail/CVE-2026-64089",
      "https://www.cve.org/CVERecord?id=CVE-2026-64089"
    ],
    "title": "kernel: batman-adv: tt: fix negative last_changeset_len",
    "updated": "2026-07-19T00:00:00+00:00",
    "vendors": [],
    "weaknesses": [
      "CWE-190"
    ]
  }
}