iommu/amd: Fix undefined behavior in devid_write debugfs function (CVE-2026-92505) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-92505

iommu/amd: Fix undefined behavior in devid_write debugfs function

Answer in brief

CVE-2026-92505 records a Unknown severity vulnerability in iommu/amd: Fix undefined behavior in devid_write debugfs function. 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 Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 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	>=2e98940f123d9c69d4759078aea9a536244c98d3 <8aabe0fba01486b5d893e708b05a8fa7f1b7efbb \|\| >=2e98940f123d9c69d4759078aea9a536244c98d3 <99d42aef089a07cfb1d404a7227ac9dc7628b497 \|\| >=2e98940f123d9c69d4759078aea9a536244c98d3 <843e149989665f8309ad2efe6048dc76591e1f94	8aabe0fba01486b5d893e708b05a8fa7f1b7efbb, 99d42aef089a07cfb1d404a7227ac9dc7628b497, 843e149989665f8309ad2efe6048dc76591e1f94
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 8aabe0fba01486b5d893e708b05a8fa7f1b7efbb if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Fix undefined behavior in devid_write debugfs function When for_each_pci_segment() loop completes without finding a matching segment, the pci_seg pointer is not NULL but points to an invalid memory location (the list head). Accessing pci_seg->id after the loop causes undefined behavior. Fix this by handling the successful case inside the loop and returning -EINVAL after the loop if no matching segment is found.

Quoted source text, attributed separately from HOL analysis.