{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b"
            },
            {
              "fixed": "7e5d007e0df946bffb8542fb112e0044014a5897"
            },
            {
              "fixed": "2997f4bd1f982e7013709946e00be89b507693fa"
            },
            {
              "fixed": "95c71365a2222908441b54d6f2c315e0c79fcec3"
            },
            {
              "fixed": "69d61639bc7e963c3b645e570279d731e7c89062"
            },
            {
              "fixed": "f970646b9a39539d1bac86822ac78b5915455ea9"
            },
            {
              "fixed": "de6c1dc3c7d01a152607e6fcecee4d5288283f10"
            },
            {
              "fixed": "cf2199171ef799ca7270019125f4a91bd20ad4d9"
            },
            {
              "fixed": "3a359bf5c61d52e7f09754108309d637532164a6"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.13.0"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.169"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.135"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.82"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.23"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31659.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: reject oversized global TT response buffers\n\nbatadv_tt_prepare_tvlv_global_data() builds the allocation length for a\nglobal TT response in 16-bit temporaries. When a remote originator\nadvertises a large enough global TT, the TT payload length plus the VLAN\nheader offset can exceed 65535 and wrap before kmalloc().\n\nThe full-table response path still uses the original TT payload length when\nit fills tt_change, so the wrapped allocation is too small and\nbatadv_tt_prepare_tvlv_global_data() writes past the end of the heap object\nbefore the later packet-size check runs.\n\nFix this by rejecting TT responses whose TVLV value length cannot fit in\nthe 16-bit TVLV payload length field.",
  "id": "CVE-2026-31659",
  "modified": "2026-07-08T05:38:40.118154835Z",
  "published": "2026-04-24T14:45:10.254Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2997f4bd1f982e7013709946e00be89b507693fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a359bf5c61d52e7f09754108309d637532164a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/69d61639bc7e963c3b645e570279d731e7c89062"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e5d007e0df946bffb8542fb112e0044014a5897"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95c71365a2222908441b54d6f2c315e0c79fcec3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf2199171ef799ca7270019125f4a91bd20ad4d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de6c1dc3c7d01a152607e6fcecee4d5288283f10"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f970646b9a39539d1bac86822ac78b5915455ea9"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31659.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31659"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "batman-adv: reject oversized global TT response buffers"
}