iommufd/viommu: Release the igroup lock on the vdevice_size error path (CVE-2026-80687) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80687

iommufd/viommu: Release the igroup lock on the vdevice_size error path

Answer in brief

CVE-2026-80687 records a Unknown severity vulnerability in iommufd/viommu: Release the igroup lock on the vdevice_size error path. 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 28, 2026Updated Aug 28, 2026Source checked Aug 28, 2026First seen by HOL Aug 28, 2026Material review Aug 28, 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	>=ed42eee797ff3dc889ade63c1dd7c4f430699e23 <294b464b2be7e57872864cb6936e1d9c7294f89d \|\| >=ed42eee797ff3dc889ade63c1dd7c4f430699e23 <ca9e49e1c8931a4e6e743a1f1d2e7f977f774b86 \|\| >=ed42eee797ff3dc889ade63c1dd7c4f430699e23 <339bd11591593ab7ce88136ab7fd01ef3813b724	294b464b2be7e57872864cb6936e1d9c7294f89d, ca9e49e1c8931a4e6e743a1f1d2e7f977f774b86, 339bd11591593ab7ce88136ab7fd01ef3813b724
Linux/Linuxgeneric	6.17	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 294b464b2be7e57872864cb6936e1d9c7294f89d if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 28, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: iommufd/viommu: Release the igroup lock on the vdevice_size error path iommufd_vdevice_alloc_ioctl() takes idev->igroup->lock, then validates the driver's vdevice_size against the core structure size with a WARN_ON_ONCE. On failure that guard jumps to out_put_idev, below out_unlock_igroup, so it skips the mutex_unlock(), leaving the igroup lock held and deadlocking the next vDEVICE operation on that group. Jump to out_unlock_igroup instead.

Quoted source text, attributed separately from HOL analysis.