Critical 9.8Published Apr 24, 2026

CVE-2026-31659batman-adv: reject oversized global TT response buffers

Updated under an hour ago (Oct 27, 2026, 11:50 PM ET)

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Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-190
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	7ea7b4a142758deaf46c1af0ca9ceca6dd55138b builds before 7e5d007e0df946bffb8542fb112e0044014a5897; from 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b before 2997f4bd1f982e7013709946e00be89b507693fa; from 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b before 95c71365a2222908441b54d6f2c315e0c79fcec3; from 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b before 69d61639bc7e963c3b645e570279d731e7c89062; from 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b before f970646b9a39539d1bac86822ac78b5915455ea9; from 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b before de6c1dc3c7d01a152607e6fcecee4d5288283f10; from 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b before cf2199171ef799ca7270019125f4a91bd20ad4d9; 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b builds before 3a359bf5c61d52e7f09754108309d637532164a6	CNA record
linux linux_kernel linux:linux_kernel	from 3.13.1 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.169; from 6.2 before 6.6.135; from 6.7 before 6.12.82; from 6.13 before 6.18.23; from 6.19 before 6.19.13; 3.13; and 7 more ranges	NVD

References

References

https://git.kernel.org/stable/c/7e5d007e0df946bffb8542fb112e0044014a5897	patch
https://git.kernel.org/stable/c/2997f4bd1f982e7013709946e00be89b507693fa	patch
https://git.kernel.org/stable/c/95c71365a2222908441b54d6f2c315e0c79fcec3	patch
https://git.kernel.org/stable/c/69d61639bc7e963c3b645e570279d731e7c89062	patch
https://git.kernel.org/stable/c/f970646b9a39539d1bac86822ac78b5915455ea9	patch
https://git.kernel.org/stable/c/de6c1dc3c7d01a152607e6fcecee4d5288283f10	patch
https://git.kernel.org/stable/c/cf2199171ef799ca7270019125f4a91bd20ad4d9	patch
https://git.kernel.org/stable/c/3a359bf5c61d52e7f09754108309d637532164a6	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.