Numeric Truncation Error in Linux kernel - CVE-2026-80839
Published: September 5, 2026
Vulnerability identifier: #VU147077
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80839
CWE-ID: CWE-197
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to read memory beyond the packet buffer.
The vulnerability exists due to numeric truncation in batadv_tvlv_call_handler() when processing a received multicast TVLV with an unrepresentable end offset. A remote attacker can send a multicast TVLV with an oversized end offset to read memory beyond the packet buffer.
Affected software
Linux kernel
How to mitigate CVE-2026-80839
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/1b466746fe109127fd983100a228cdd1f1f6ece2
- https://git.kernel.org/stable/c/2b46baa591d0a7c16b62f150917187e70d053be6
- https://git.kernel.org/stable/c/916ec741e65af072b98e475feaad98c063da1b7c
- https://git.kernel.org/stable/c/da1f5aa7ec93f2cc17f5cd30efc54f62af433cf2
- https://git.kernel.org/stable/c/f12c2de4f542e3220e17e0606f492110064f04cb