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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80685
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:53 UTC
Updated2026-08-28 08:16:53 UTC
DescriptionIn 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).

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 31a31da8a6187f1e5448ec73222e01d7d3fed4aa 9668ffe0e2a5e2399dce281620198a2e415871fc git Not specified
CNA Linux Linux affected 31a31da8a6187f1e5448ec73222e01d7d3fed4aa c649324571206a30949765320b91ccdb4c1722dc git Not specified
CNA Linux Linux affected 31a31da8a6187f1e5448ec73222e01d7d3fed4aa 7441d6348c70738e9ed307510db171c7a9b3f4bf git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c649324571206a30949765320b91ccdb4c1722dc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9668ffe0e2a5e2399dce281620198a2e415871fc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7441d6348c70738e9ed307510db171c7a9b3f4bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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