CVE-2026-80593 hwmon: (asus_atk0110) Check package count before accessing element
A missing check in the asus_atk0110 kernel driver allows an out-of-bounds read via malformed firmware, potentially causing a system crash.
- 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-2026-80593?
CVE-2026-80593 is a high-severity vulnerability in Linux, published on 28 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:
hwmon: (asus_atk0110) Check package count before accessing element
atk_ec_present() walks the management group package returned by the GGRP ACPI method and, for each sub-package, reads its first element:
id = &obj->package.elements[0]; if (id->type != ACPI_TYPE_INTEGER)
without checking that the sub-package is non-empty. ACPICA allocates the element array with exactly package.count entries, so for a sub-package with a zero count this reads past the allocation.
The sibling function atk_debugfs_ggrp_open() performs the same access but skips empty packages with a package.count check first. Add the same check to atk_ec_present() so a malformed firmware package cannot trigger an out-of-bounds read.
Which versions are affected by CVE-2026-80593?
How do I fix CVE-2026-80593?
Apply the vendor's patch.
Is CVE-2026-80593 being exploited?
There is no known exploitation of CVE-2026-80593 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80593, DEBIAN-CVE-2026-80593, GHSA-38hv-9295-2cxw, UBUNTU-CVE-2026-80593.