SB2026091808 - Race condition in Linux kernel batman-adv
Published: September 18, 2026
Security Bulletin ID
SB2026091808
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Race condition (CVE-ID: CVE-2026-93203)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to corrupt backbone gateway CRC values.
The vulnerability exists due to a race condition in batadv_bla_add_claim() when processing concurrent CLAIM frames for the same client. A remote attacker can send concurrent CLAIM frames to corrupt backbone gateway CRC values.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/08645ab95768b88e2ff85a89211994651710465b
- https://git.kernel.org/stable/c/1d390db003cbb52cdd86837608bff3794501a5ea
- https://git.kernel.org/stable/c/3d4a9ae2c69c0fe4c3c69587288241243bb7a39b
- https://git.kernel.org/stable/c/8bcfa58c4277bff1882a23547c37ab08aa1de12f
- https://git.kernel.org/stable/c/a3e07db74f22a85aeeb51c600da5c98b9cbca11f
- https://git.kernel.org/stable/c/ad982d925f00d860d2467811256ffadcccd9e4a7
- https://git.kernel.org/stable/c/d5b0e7574da5a485f4dbec32a15911900a4487c2
- https://git.kernel.org/stable/c/e54602d9e38db8573f2097d60c7ea8be0a5af1fa