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batman-adv: reject oversized global TT response buffers

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-31659

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-31659

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
        "lessThan": "7e5d007e0df946bffb8542fb112e0044014a5897",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
        "lessThan": "2997f4bd1f982e7013709946e00be89b507693fa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
        "lessThan": "95c71365a2222908441b54d6f2c315e0c79fcec3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
        "lessThan": "69d61639bc7e963c3b645e570279d731e7c89062",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
        "lessThan": "f970646b9a39539d1bac86822ac78b5915455ea9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
        "lessThan": "de6c1dc3c7d01a152607e6fcecee4d5288283f10",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
        "lessThan": "cf2199171ef799ca7270019125f4a91bd20ad4d9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
        "lessThan": "3a359bf5c61d52e7f09754108309d637532164a6",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/batman-adv/translation-table.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.169",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.135",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.82",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.23",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.13",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/batman-adv/translation-table.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31659

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#39940 · Revision 1
Added to Heist Feed
Publisher date
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