CVE-2026-31659 (GCVE-0-2026-31659)
Vulnerability from cvelistv5
Published
2026-04-24 14:45
Modified
2026-04-27 14:04
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: reject oversized global TT response buffers batadv_tt_prepare_tvlv_global_data() builds the allocation length for a global TT response in 16-bit temporaries. When a remote originator advertises a large enough global TT, the TT payload length plus the VLAN header offset can exceed 65535 and wrap before kmalloc(). The full-table response path still uses the original TT payload length when it fills tt_change, so the wrapped allocation is too small and batadv_tt_prepare_tvlv_global_data() writes past the end of the heap object before the later packet-size check runs. Fix this by rejecting TT responses whose TVLV value length cannot fit in the 16-bit TVLV payload length field.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b
Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b
Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b
Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b
Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b
Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b
Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b
Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b
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{
  "containers": {
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          "programFiles": [
            "net/batman-adv/translation-table.c"
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      "cpeApplicability": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-27T14:04:46.116Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7e5d007e0df946bffb8542fb112e0044014a5897"
        },
        {
          "url": "https://git.kernel.org/stable/c/2997f4bd1f982e7013709946e00be89b507693fa"
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        {
          "url": "https://git.kernel.org/stable/c/95c71365a2222908441b54d6f2c315e0c79fcec3"
        },
        {
          "url": "https://git.kernel.org/stable/c/69d61639bc7e963c3b645e570279d731e7c89062"
        },
        {
          "url": "https://git.kernel.org/stable/c/f970646b9a39539d1bac86822ac78b5915455ea9"
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        {
          "url": "https://git.kernel.org/stable/c/de6c1dc3c7d01a152607e6fcecee4d5288283f10"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf2199171ef799ca7270019125f4a91bd20ad4d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a359bf5c61d52e7f09754108309d637532164a6"
        }
      ],
      "title": "batman-adv: reject oversized global TT response buffers",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31659",
    "datePublished": "2026-04-24T14:45:10.254Z",
    "dateReserved": "2026-03-09T15:48:24.129Z",
    "dateUpdated": "2026-04-27T14:04:46.116Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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