PT-2026-35011 · Linux · Linux Kernel

Published 2026-04-24 · Updated 2026-05-26 · CVE-2026-31659

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the batman-adv module where the batadv tt prepare tvlv global data() function calculates the allocation length for a global TT response using 16-bit temporaries. If a remote originator advertises a sufficiently large global TT, the sum of the TT payload length and the VLAN header offset can exceed 65535, causing an integer wrap before the kmalloc() call. Because the full-table response path continues to use the original payload length when filling tt change, the allocated buffer is too small, leading to a heap-based buffer overflow where data is written past the end of the heap object.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-31659

ECHO-D506-0BA3-234B

Affected Products

Linux Kernel

References · 19

• https://cve.org/CVERecord?id=CVE-2026-31659 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-31659 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2026-31659 · Vendor Advisory
• https://git.kernel.org/stable/c/95c71365a2222908441b54d6f2c315e0c79fcec3 · Patch
• https://ubuntu.com/security/CVE-2026-31659 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31659 · Vendor Advisory
• https://git.kernel.org/stable/c/cf2199171ef799ca7270019125f4a91bd20ad4d9 · Patch
• https://git.kernel.org/stable/c/de6c1dc3c7d01a152607e6fcecee4d5288283f10 · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-31659 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31659 · Vendor Advisory
• https://git.kernel.org/stable/c/f970646b9a39539d1bac86822ac78b5915455ea9 · Patch
• https://git.kernel.org/stable/c/7e5d007e0df946bffb8542fb112e0044014a5897 · Patch
• https://git.kernel.org/stable/c/3a359bf5c61d52e7f09754108309d637532164a6 · Patch
• https://git.kernel.org/stable/c/2997f4bd1f982e7013709946e00be89b507693fa · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-31659 · Security Note