CVE-2026-80599 batman-adv: dat: ensure accessible eth_hdr proto field
A missing bounds check in the batman-adv kernel module allows out-of-bounds memory access, potentially causing crashes or information leaks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80599?
CVE-2026-80599 is a high-severity memory corruption vulnerability in Linux, published on 28 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: dat: ensure accessible eth_hdr proto field
When batadv_get_vid() accesses the proto field of the ethernet header, it is not checking if the data itself is accessible. The caller is responsible for it. But in contrast to other call sites, batadv_dat_get_vid() and its caller didn't make sure this is true. This could have caused an out-of-bounds access.
Which versions are affected by CVE-2026-80599?
How do I fix CVE-2026-80599?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-80599 being exploited?
There is no known exploitation of CVE-2026-80599 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80599, DEBIAN-CVE-2026-80599, GHSA-j72w-p49p-cjqq, UBUNTU-CVE-2026-80599.