CVE-2026-43044 crypto: caam - fix DMA corruption on long hmac keys
A memory corruption vulnerability in the Linux kernel's CAAM crypto driver allows attackers to corrupt neighboring memory via long HMAC keys, 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-2026-43044?
CVE-2026-43044 is a high-severity memory corruption vulnerability in Linux kernel, published on 1 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:
crypto: caam - fix DMA corruption on long hmac keys
When a key longer than block size is supplied, it is copied and then hashed into the real key. The memory allocated for the copy needs to be rounded to DMA cache alignment, as otherwise the hashed key may corrupt neighbouring memory.
The rounding was performed, but never actually used for the allocation. Fix this by replacing kmemdup with kmalloc for a larger buffer, followed by memcpy.
Which versions are affected by CVE-2026-43044?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43044?
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-2026-43044 being exploited?
There is no known exploitation of CVE-2026-43044 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43044, DEBIAN-CVE-2026-43044, GHSA-cjp6-6pg7-25q5, ROOT-OS-UBUNTU-2404-CVE-2026-43044, UBUNTU-CVE-2026-43044.