CVE-2026-93148 bpf: Reject MEM_ALLOC BTF accesses past object bounds
A missing bounds check in the Linux kernel BPF subsystem allows out-of-bounds memory access, potentially leading to code execution or privilege escalation.
- 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-2026-93148?
CVE-2026-93148 is a high-severity memory corruption vulnerability in Linux, published on 17 Sep 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:
bpf: Reject MEM_ALLOC BTF accesses past object bounds
BTF struct walks relax the struct-size check for accesses through a trailing flexible array. That is valid for ordinary BTF type walking, but PTR_TO_BTF_ID | MEM_ALLOC values point to objects allocated with the static BTF type size.
When walking a MEM_ALLOC object, reject the access before applying the flexible-array relaxation if the access range extends past the struct size. Apply the same policy to struct ID matching so kfunc and kptr type checks do not walk past the allocated object bounds either.
Which versions are affected by CVE-2026-93148?
How do I fix CVE-2026-93148?
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-2026-93148 being exploited?
There is no known exploitation of CVE-2026-93148 in the wild and no public exploit code.
Sources
Also known as AZL-102632, BELL-CVE-2026-93148, DEBIAN-CVE-2026-93148, GHSA-q2v7-328v-qfqj, UBUNTU-CVE-2026-93148.