s390/vfio_ccw: Ensure first IDAW remains constant (CVE-2026-80551) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80551

s390/vfio_ccw: Ensure first IDAW remains constant

Answer in brief

CVE-2026-80551 records a Unknown severity vulnerability in s390/vfio_ccw: Ensure first IDAW remains constant. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 26, 2026Updated Aug 26, 2026Source checked Aug 26, 2026First seen by HOL Aug 26, 2026Material review Aug 26, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=01aa26c672c0eb771de4aaa2a8ccf6055778887b <0d46c2565f173bcddcdcaf44a4f69789a20535e2 \|\| >=01aa26c672c0eb771de4aaa2a8ccf6055778887b <08ef2a82115690d6e229615872ac1731af732497 \|\| >=01aa26c672c0eb771de4aaa2a8ccf6055778887b <fc59e9482117ebdccd6dc7fa8082f8b980fd021e \|\| >=01aa26c672c0eb771de4aaa2a8ccf6055778887b <565bef268d75bf7df665bce6923a88cd0eb74592	0d46c2565f173bcddcdcaf44a4f69789a20535e2, 08ef2a82115690d6e229615872ac1731af732497, fc59e9482117ebdccd6dc7fa8082f8b980fd021e, 565bef268d75bf7df665bce6923a88cd0eb74592
Linux/Linuxgeneric	5.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 0d46c2565f173bcddcdcaf44a4f69789a20535e2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 26, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Ensure first IDAW remains constant The first IDAW in a list does not need to be on a 2K/4K boundary like all others, and so is read separately to accurately calculate the size of the buffer needed to read the full IDAL. Verify that the address found in the first IDAW is unchanged between reads, to ensure a consistent set of IDAWs being worked with.

Quoted source text, attributed separately from HOL analysis.