CVE-2026-89730 fpga: altera-cvp: Avoid out-of-bounds read in trailing byte write
A local attacker can trigger a kernel crash by exploiting an out-of-bounds read in the Altera CVP FPGA driver during image loading.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89730?
CVE-2026-89730 is a memory corruption vulnerability in Linux, published on 11 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:
fpga: altera-cvp: Avoid out-of-bounds read in trailing byte write
The trailing byte path in altera_cvp_send_block() dereferences a u32 pointer even when only 1-3 bytes remain in the input buffer. If the buffer ends at a page or scatterlist boundary, this can read past the valid image data and fault.
Copy the remaining bytes into a zero-initialized u32 before writing the final word so only valid bytes are read from the input buffer.
Which versions are affected by CVE-2026-89730?
How do I fix CVE-2026-89730?
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-2026-89730 being exploited?
There is no known exploitation of CVE-2026-89730 in the wild and no public exploit code.
Sources
Also known as AZL-100439, BELL-CVE-2026-89730, DEBIAN-CVE-2026-89730, GHSA-f682-7h79-jmqf, UBUNTU-CVE-2026-89730.