GHSA-8JFV-FRVF-4G4V
Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-04-27 15:30In 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.
{
"affected": [],
"aliases": [
"CVE-2026-31659"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-04-24T15:16:45Z",
"severity": "CRITICAL"
},
"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": "GHSA-8jfv-frvf-4g4v",
"modified": "2026-04-27T15:30:46Z",
"published": "2026-04-24T15:32:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31659"
},
{
"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"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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