CVE-2026-93115

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.

References

• https://git.kernel.org/stable/c/71ba8b6e28f7a83b724036f5de07e03bb5473286
• https://git.kernel.org/stable/c/950d8e8375f3ff4787de51b7bdf8dd23a3ad6547
• https://git.kernel.org/stable/c/a75b84119e56fc34b0f1403f3b93d357a55dabb6
• https://git.kernel.org/stable/c/bf1e0cc5cc1d4e71b699fc98cc9198ead0ed53e0
• https://git.kernel.org/stable/c/c38cce70adef874c2a7b5132c14d6c221401deff