CVE-2026-46231 batman-adv: bla: put backbone reference on failed claim hash insert
A reference leak in the batman-adv module can lead to memory exhaustion and denial of service in the Linux kernel.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46231?
CVE-2026-46231 is a medium-severity memory corruption vulnerability in Linux kernel, published on 28 May 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: bla: put backbone reference on failed claim hash insert
When batadv_bla_add_claim() fails to insert a new claim into the hash, it leaked a reference to the backbone_gw for which the claim was intended. Call batadv_backbone_gw_put() on the error path to release the reference and avoid leaking the backbone_gw object.
Which versions are affected by CVE-2026-46231?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46231?
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-2026-46231 being exploited?
There is no known exploitation of CVE-2026-46231 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88974, BELL-CVE-2026-46231, DEBIAN-CVE-2026-46231, GHSA-3m8h-6hx2-2479, ROOT-OS-DEBIAN-11-CVE-2026-46231, ROOT-OS-DEBIAN-12-CVE-2026-46231 and 3 more.