CVE-2026-93115 platform/mellanox: mlxbf-pmc: Check ACPI_COMPANION() against NULL
A local attacker with high privileges can force-bind a driver to a device lacking an ACPI companion, causing a kernel NULL pointer dereference and system crash.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93115?
CVE-2026-93115 is a vulnerability in Linux, published on 17 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:
platform/mellanox: mlxbf-pmc: Check ACPI_COMPANION() against NULL
Every platform driver can be forced to match a device that doesn't match its list of device IDs because of device_match_driver_override(), so platform drivers that rely on the existence of a device's ACPI companion object need to verify its presence.
mlxbf_pmc_probe() passes the result of ACPI_COMPANION() to acpi_device_hid(), which dereferences it, so force-binding the driver to a device without an ACPI companion leads to a NULL pointer dereference.
Accordingly, add a requisite ACPI_COMPANION() check against NULL to the mlxbf-pmc driver and return -ENODEV when the companion is missing.
Which versions are affected by CVE-2026-93115?
How do I fix CVE-2026-93115?
Apply the vendor's patch.
Is CVE-2026-93115 being exploited?
There is no known exploitation of CVE-2026-93115 in the wild and no public exploit code.
Sources
Also known as AZL-102006, BELL-CVE-2026-93115, DEBIAN-CVE-2026-93115, GHSA-hf49-hh29-x2wv, UBUNTU-CVE-2026-93115.