platform/mellanox: mlxbf-pmc: Check ACPI_COMPANION() against NULL

Summary

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.

Timeline

1. Sep 17, 2026, 4:11 PM UTCCVE published
2. Oct 19, 2026, 9:05 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 1a218d312e65ec396b2739056a8ea78493015f21 · fixed in 950d8e8375f3ff4787de51b7bdf8dd23a3ad6547; From 1a218d312e65ec396b2739056a8ea78493015f21 · fixed in fdfb736282b9665c0169df0c4152ec91fdea2767; From 1a218d312e65ec396b2739056a8ea78493015f21 · fixed in bf1e0cc5cc1d4e71b699fc98cc9198ead0ed53e0; From 1a218d312e65ec396b2739056a8ea78493015f21 · fixed in a75b84119e56fc34b0f1403f3b93d357a55dabb6; From 1a218d312e65ec396b2739056a8ea78493015f21 · fixed in 71ba8b6e28f7a83b724036f5de07e03bb5473286; From 1a218d312e65ec396b2739056a8ea78493015f21 · fixed in d25dd08268aeaceb485189aaa84aa6d68a460291; From 1a218d312e65ec396b2739056a8ea78493015f21 · fixed in c38cce70adef874c2a7b5132c14d6c221401deff

• Linux Linux

  5.11

• KernelLinux

  From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 7