SB2026042555 - Heap-based buffer overflow in Linux kernel batman-adv

Description

This security bulletin contains information about 1 vulnerability.

1) Heap-based buffer overflow (CVE-ID: CVE-2026-31659)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service or execute arbitrary code.

The vulnerability exists due to a heap-based buffer overflow in batadv_tt_prepare_tvlv_global_data() when processing an oversized global TT response from a remote originator. A remote attacker can advertise a large global TT to trigger a wrapped allocation and write past the end of the heap object to cause a denial of service or execute arbitrary code.

Remediation

Install update from vendor's website.

References

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