SB2026091709 - Reliance on undefined behavior in Linux kernel batman-adv

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Main Vulnerability Database SB2026091709

SB2026091709 - Reliance on undefined behavior in Linux kernel batman-adv

Published: September 17, 2026

Security Bulletin ID SB2026091709
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Adjecent network
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Reliance on undefined behavior (CVE-ID: CVE-2026-89949)

CWE-ID: CWE-758 - Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

CVSSv4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper handling of unaligned memory access in the batman-adv distributed ARP table IP extraction functions when processing ARP packets with unaligned data in socket buffers. A remote attacker can send an ARP packet to cause a denial of service.

Only hardware without native support for unaligned reads is affected.


Remediation

Install update from vendor's website.

References