CVE-2026-43330 crypto: caam - fix overflow on long hmac keys
A buffer overflow in the Linux kernel's CAAM crypto driver allows attackers to corrupt memory and potentially execute code or escalate privileges.
- 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-2026-43330?
CVE-2026-43330 is a high-severity vulnerability in Linux kernel, published on 8 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 overflow 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 copying is performed using kmemdup, however this leads to an overflow: reading more bytes (aligned_len - keylen) from the keylen source buffer. Fix this by replacing kmemdup with kmalloc, followed by memcpy.
Weakness: CWE-787
Which versions are affected by CVE-2026-43330?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43330?
Apply the vendor's patch.
Is CVE-2026-43330 being exploited?
There is no known exploitation of CVE-2026-43330 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43330, DEBIAN-CVE-2026-43330, GHSA-7669-mcjm-pwg9, ROOT-OS-UBUNTU-2404-CVE-2026-43330, UBUNTU-CVE-2026-43330.