nvdimm: pmem: keep PREFLUSH before data writes

Answer in brief

CVE-2026-98161 records a Unknown severity vulnerability in nvdimm: pmem: keep PREFLUSH before data writes. The current sources do not mark it as known exploited. The current feed maps 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 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
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). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <770a90c2127220f0fc194ce909ad4f0842e141cb \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <72561ca1ab96f0f0f32737a6171641e05a318538 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c644a2f8fef5618fcf453c591177700fd07dd024 \|\| >=0 <6.18.52 \|\| >=0 <7.2.6	770a90c2127220f0fc194ce909ad4f0842e141cb, 72561ca1ab96f0f0f32737a6171641e05a318538, c644a2f8fef5618fcf453c591177700fd07dd024, 6.18.52, 7.2.6

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux.
Review the reported fix. Update Linux/Linux to 770a90c2127220f0fc194ce909ad4f0842e141cb if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: nvdimm: pmem: keep PREFLUSH before data writes pmem_submit_bio() records a REQ_PREFLUSH error, but continues to copy the bio data and can later overwrite the error with a successful REQ_FUA flush. That lets data writes run after a failed preflush and can complete the bio successfully despite the failed ordering barrier. Run the REQ_PREFLUSH flush synchronously before touching the bio data and complete the bio with the flush error if it fails. Keep asynchronous flush chaining for REQ_FUA. At that point, data copy has completed and the parent bio can wait for the chained flush bio.

Quoted source text, attributed separately from HOL analysis.