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ReviewHigh

CVE-2026-80549

Linux

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.

CVSS
8.2
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.27
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.2

Vulnerability overview

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.

Affected product and versions

Product
Linux
Affected versions
>= 204b394a23ad5e30944f23518e21e844614da2ff < c9b85aa2cf73ea645e55e2c2670e0ddebfe1589b, >= 204b394a23ad5e30944f23518e21e844614da2ff < f98a9890ca42f4223d2d4c50e0660af3e012fcb4, >= 204b394a23ad5e30944f23518e21e844614da2ff < 4e3301e2a651d742c05914f6074a25b8e41bce19, >= 204b394a23ad5e30944f23518e21e844614da2ff < af1759d8e6e6da9ba94f30a2f92546f406899aa7, >= 204b394a23ad5e30944f23518e21e844614da2ff < 56100baa0eb7055b1026dfa73e696e8066ff71fd, >= 204b394a23ad5e30944f23518e21e844614da2ff < 0c11f61a876ed6fcca53d442ed3f33ea8362a0f9, >= 6.0
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE
Not available