SB2026052954 - Use-after-free in Linux kernel batman-adv
Published: May 29, 2026
Security Bulletin ID
SB2026052954
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-46238)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in the BAT IV neighbor state when handling purge operations on cached originator data. A local user can trigger network state changes that cause a stale originator pointer to be dereferenced to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/09dc0d1a12222ffca6481916eab3cfea477b9620
- https://git.kernel.org/stable/c/67bceeb22207f1f5a402973a3a0809e5f2698f38
- https://git.kernel.org/stable/c/6e20700f8c524ac379ba8274ff5d453023b7c006
- https://git.kernel.org/stable/c/aafcbaf1159ea224528ca4075d0ba8c10ef374af
- https://git.kernel.org/stable/c/f03e8583532941b07761c5429de7d50766fa3110