CVE-2026-72226 batman-adv: tt: prevent TVLV OOB check overflow
An integer overflow in the batman-adv kernel module allows bypassing bounds checks, potentially leading to out-of-bounds access and system compromise.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72226?
CVE-2026-72226 is a critical vulnerability in Linux, published on 15 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: tt: prevent TVLV OOB check overflow
A TT unicast TVLV contains the number of VLANs stored in it. This number is an u16 and gets multiplied by the size of the struct batadv_tvlv_tt_vlan_data (8 bytes). The size can therefore overflow the u16 used to store the tt_vlan_len. All additional safety checks to prevent out-of-bounds access of the TVLV buffer are invalid due to this overflow.
Using size_t prevents this overflow and ensures that the safety checks compare against the actual buffer requirements.
Which versions are affected by CVE-2026-72226?
How do I fix CVE-2026-72226?
Apply the vendor's patch.
Is CVE-2026-72226 being exploited?
There is no known exploitation of CVE-2026-72226 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72226, DEBIAN-CVE-2026-72226, GHSA-5r79-5r2g-4hhm, UBUNTU-CVE-2026-72226.