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Vulnerability record · CVE-2026-31659 · published 24 April 2026

CVE-2026-31659: Linux kernel vulnerability

Linux · Linux Kernel

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.

9.8 CVSS 3.1 Critical EPSS 0.76% · top 46.7%
9.8CVSS 3.1 base score
0.76%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-31659), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.