vfio/qat: fix f_pos race in qat_vf_resume_write() (CVE-2026-74306) | HOL Guard CVE

High · CVSS 7.8CVE-2026-74306

vfio/qat: fix f_pos race in qat_vf_resume_write()

Answer in brief

CVE-2026-74306 records a High severity (CVSS 7.8) vulnerability in vfio/qat: fix f_pos race in qat_vf_resume_write(). 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 15, 2026Updated Aug 17, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.8. 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	>=bb208810b1abf1c84870cfbe1cc9cf1a1d35c607 <6465af0004dc1b067129a26ef44f19cdf13bbce6 \|\| >=bb208810b1abf1c84870cfbe1cc9cf1a1d35c607 <d416dcefdbac90d96b22485fd93f28229ad9984b \|\| >=bb208810b1abf1c84870cfbe1cc9cf1a1d35c607 <b6fd7a40a66485c8aa8156d8fcf50b95cb8ba281 \|\| >=bb208810b1abf1c84870cfbe1cc9cf1a1d35c607 <4ec5e932e636896e97e4c6a8205b0ac76d52421a	6465af0004dc1b067129a26ef44f19cdf13bbce6, d416dcefdbac90d96b22485fd93f28229ad9984b, b6fd7a40a66485c8aa8156d8fcf50b95cb8ba281, 4ec5e932e636896e97e4c6a8205b0ac76d52421a
Linux/Linuxgeneric	6.10	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 6465af0004dc1b067129a26ef44f19cdf13bbce6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: vfio/qat: fix f_pos race in qat_vf_resume_write() qat_vf_resume_write() checks filp->f_pos before taking migf->lock, but copies into the migration-state buffer after taking the lock and re-reading the shared file position. Two concurrent writers could therefore pass the bounds check with the old offset, then have the second writer copy after the first advanced f_pos, writing past the end of the migration-state buffer. Take migf->lock before doing the boundary checks.

Quoted source text, attributed separately from HOL analysis.