mm/huge_memory: preserve pmd_swp_uffd_wp on device-private PMD downgrade

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72180
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:21:36 UTC
Updated2026-08-17 06:18:18 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mm/huge_memory: preserve pmd_swp_uffd_wp on device-private PMD downgrade change_non_present_huge_pmd() rewrites a writable device-private PMD swap entry into a readable one without carrying pmd_swp_uffd_wp() across. The PTE-level change_softleaf_pte() does this correctly; mirror that here, matching what copy_huge_pmd() does for the fork path. Without the carry, a plain mprotect() over a UFFD_WP-marked device-private THP strips the bit and the trap is bypassed on swap-in.

Risk And Classification

EPSS: 0.002010000 probability, percentile 0.102980000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 368076f52ebeecd33e10a9f80905d7508b6b6149 2611f7521c6c124b1bef1be4fc319e0ca144502f git Not specified
CNA Linux Linux affected 368076f52ebeecd33e10a9f80905d7508b6b6149 f7e2c21bd1f57cd5350eecdfdb5d6025ca6afbab git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2611f7521c6c124b1bef1be4fc319e0ca144502f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f7e2c21bd1f57cd5350eecdfdb5d6025ca6afbab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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