CVE-2026-80600 batman-adv: dat: acquire ARP hw source only after skb realloc
A use-after-free vulnerability in the Linux kernel's batman-adv module allows attackers to potentially execute code or cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80600?
CVE-2026-80600 is a critical use after free vulnerability in Linux, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: dat: acquire ARP hw source only after skb realloc
The pskb_may_pull() called by batadv_get_vid() could reallocate the buffer behind the skb. Variables which were pointing to the old buffer need to be reassigned to avoid an use-after-free.
Which versions are affected by CVE-2026-80600?
How do I fix CVE-2026-80600?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-80600 being exploited?
There is no known exploitation of CVE-2026-80600 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80600, DEBIAN-CVE-2026-80600, GHSA-m5gp-6f33-45m5, UBUNTU-CVE-2026-80600.