CVE-2026-31659

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-31659

Key Details

CVE	CVE-2026-31659
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-31659
CVE	https://www.cve.org/CVERecord?id=CVE-2026-31659

Source

Reference

NVD

CVE