{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7"
            },
            {
              "fixed": "4c4c2f340f4c27373bfcac8dc5032ce7bb474e47"
            },
            {
              "fixed": "33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430"
            },
            {
              "fixed": "3c96dff00998314983b68a3e7caac07a66ebe496"
            },
            {
              "fixed": "32edd2a28e112064020a2f319a8cb8a9e5a09767"
            },
            {
              "fixed": "4dab98961426d0cf6a1599cda6950b7596ca2fcd"
            },
            {
              "fixed": "730de8733dd90f70d7580a9b329b971f8e1474a2"
            },
            {
              "fixed": "ed28ead3420c373a7928622f114bc6168075d1e1"
            },
            {
              "fixed": "b64963a2ceeb7529310b6cf253a1e540784422f4"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.1.0"
            },
            {
              "fixed": "5.10.258"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.142"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.92"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.34"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64088.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: fix negative tt_buff_len\n\nbatadv_orig_node::tt_buff_len was declared as s16, but the field is never\nintended to hold a negative value. When a value greater than 32767 is\nassigned, it wraps to a negative signed integer.\n\nIn batadv_send_other_tt_response(), tt_buff_len is temporarily widened to\ns32. The incorrectly negative s16 value propagates into the s32, causing\nbatadv_tt_prepare_tvlv_global_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_other_tt_response().",
  "id": "CVE-2026-64088",
  "modified": "2026-08-13T03:51:36.449051505Z",
  "published": "2026-07-19T15:39:58.084Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/32edd2a28e112064020a2f319a8cb8a9e5a09767"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c96dff00998314983b68a3e7caac07a66ebe496"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c4c2f340f4c27373bfcac8dc5032ce7bb474e47"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4dab98961426d0cf6a1599cda6950b7596ca2fcd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/730de8733dd90f70d7580a9b329b971f8e1474a2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b64963a2ceeb7529310b6cf253a1e540784422f4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed28ead3420c373a7928622f114bc6168075d1e1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64088.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64088"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "batman-adv: tt: fix negative tt_buff_len"
}