CVE-2026-80574 Input: focaltech - fix array out-of-bounds in focaltech_process_rel_packet
An out-of-bounds write in the Focaltech input driver allows attackers to corrupt memory, potentially leading to code execution or privilege escalation.
- 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-2026-80574?
CVE-2026-80574 is a high-severity memory corruption vulnerability in Linux, published on 26 Aug 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:
Input: focaltech - fix array out-of-bounds in focaltech_process_rel_packet
Make finger2 (and also finger1) unsigned, so that if the finger index in the packet is 0 then subtracting 1 creates an array index which overflows above the existing check for FOC_MAX_FINGERS, as the existing comment says it should, instead of writing to state->fingers[-1].
Which versions are affected by CVE-2026-80574?
How do I fix CVE-2026-80574?
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-2026-80574 being exploited?
There is no known exploitation of CVE-2026-80574 in the wild and no public exploit code.
Sources
Also known as AZL-97839, BELL-CVE-2026-80574, DEBIAN-CVE-2026-80574, GHSA-qm8h-24xg-3v98, UBUNTU-CVE-2026-80574.