mm/util: don't read __page_2 for order-1 folios in snapshot_page() (CVE-2026-80685) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80685

mm/util: don't read __page_2 for order-1 folios in snapshot_page()

Answer in brief

CVE-2026-80685 records a Unknown severity vulnerability in mm/util: don't read __page_2 for order-1 folios in snapshot_page(). 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	>=31a31da8a6187f1e5448ec73222e01d7d3fed4aa <9668ffe0e2a5e2399dce281620198a2e415871fc \|\| >=31a31da8a6187f1e5448ec73222e01d7d3fed4aa <c649324571206a30949765320b91ccdb4c1722dc \|\| >=31a31da8a6187f1e5448ec73222e01d7d3fed4aa <7441d6348c70738e9ed307510db171c7a9b3f4bf	9668ffe0e2a5e2399dce281620198a2e415871fc, c649324571206a30949765320b91ccdb4c1722dc, 7441d6348c70738e9ed307510db171c7a9b3f4bf
Linux/Linuxgeneric	6.15	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 9668ffe0e2a5e2399dce281620198a2e415871fc 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: mm/util: don't read __page_2 for order-1 folios in snapshot_page() snapshot_page() currently reads __page_2 after checking nr_pages > 1, but it should only do so when nr_pages > 2. If an order-1 folio is allocated at the end of a vmemmap section, __page_2 will not exist and reading it will cause a fault. During DLPAR memory remove on a 22 TB ppc64le LPAR, snapshot_page() oopsed on the page isolation path while reading an order-1 folio's __page_2 from an adjacent absent section (unmapped vmemmap). Fix this to avoid reading memmap that doesn't exist (e.g., a vmemmap hole).

Quoted source text, attributed separately from HOL analysis.