CVE-2026-80553: s390/vfio_ccw: Cancel existing workqueues
CSIRTS triage
- What
- Existing workqueues in s390/vfio_ccw are not properly cancelled during cleanup, potentially causing resource exhaustion.
- Who is affected
- Systems running Linux kernel with s390 architecture and vfio_ccw support enabled.
- Urgency
- Medium priority; CVSS 4.1 indicates moderate DoS risk and should be patched in standard update cycles.
- Action
- Apply a Linux kernel update that ensures workqueues are properly cancelled on device removal.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80553
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-805530.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-80553 | coverage & exploitation status | NVD · CVE.org |
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