What’s Vulnerable › Vulnerabilities

CVE-2026-93115: platform/mellanox: mlxbf-pmc: Check ACPI_COMPANION() against NULL

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-19

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.

Affected products

• Linux kernel: 5.11 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

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
• https://git.kernel.org/stable/c/d25dd08268aeaceb485189aaa84aa6d68a460291
• https://git.kernel.org/stable/c/fdfb736282b9665c0169df0c4152ec91fdea2767

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