SB2026091720 - Incomplete cleanup in Linux kernel batman-adv
Published: September 17, 2026
Security Bulletin ID
SB2026091720
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Incomplete cleanup (CVE-ID: CVE-2026-89948)
CWE-ID: CWE-459 - Incomplete cleanup
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause bridge loop avoidance claims to remain after mesh interface deletion.
The vulnerability exists due to incomplete cleanup of claims in the batman-adv bridge loop avoidance claim cleanup logic when deleting a mesh interface. A local user can delete a mesh interface to cause bridge loop avoidance claims to remain after mesh interface deletion.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/76aedcde5a2489cc971d4d1e396e784a49565e96
- https://git.kernel.org/stable/c/844a95a734f178d56c7acce14c5cce2cecff7e1a
- https://git.kernel.org/stable/c/871acdf97f64cee8398f72b88b89e8b4f4816dbe
- https://git.kernel.org/stable/c/8d128c932bced74e3b1625ba3d7c78ef122a88a7
- https://git.kernel.org/stable/c/9a0c47023d3254048a1588534755d4476bcc3abc
- https://git.kernel.org/stable/c/aacffa780a37e06cd5a13d33740a6e96c3a67e6c
- https://git.kernel.org/stable/c/baeb1a28fd8e2f68193650d3664a8cd1adfd85c6
- https://git.kernel.org/stable/c/f50edb69082a8ba990cc23d642089829f99afe6a