SB20260720129 - NULL pointer dereference in Linux kernel batman-adv

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Main Vulnerability Database SB20260720129

SB20260720129 - NULL pointer dereference in Linux kernel batman-adv

Published: July 20, 2026

Security Bulletin ID SB20260720129
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) NULL pointer dereference (CVE-ID: CVE-2026-64094)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a NULL pointer dereference in batman-adv bridge loop avoidance claim handling in net/batman-adv/bridge_loop_avoidance.c when sending an ARP request after a primary interface is decoupled from its mesh interface. A local user can trigger this race condition to cause a denial of service.

The issue occurs when the primary hard interface is accessed without rtnl_lock held and its mesh interface pointer becomes NULL during the operation.


Remediation

Install update from vendor's website.

References