CVE-2026-31659Critical· 9.8▾ MidnightIn 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 temporarie…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.4%
Last analysed / modified upstream
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.
Linux >= 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b < 7e5d007e0df946bffb8542fb112e0044014a5897Linux >= 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b < 2997f4bd1f982e7013709946e00be89b507693faLinux >= 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b < 95c71365a2222908441b54d6f2c315e0c79fcec3Linux >= 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b < 69d61639bc7e963c3b645e570279d731e7c89062Linux >= 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b < f970646b9a39539d1bac86822ac78b5915455ea9Linux >= 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b < de6c1dc3c7d01a152607e6fcecee4d5288283f10Linux >= 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b < cf2199171ef799ca7270019125f4a91bd20ad4d9Linux >= 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b < 3a359bf5c61d52e7f09754108309d637532164a6Linux 3.13Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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