In 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.

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History

Sat, 15 Aug 2026 20:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-665

Sat, 15 Aug 2026 06:00:00 +0000

Type Values Removed Values Added
Description In 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.
Title mm/huge_memory: preserve pmd_swp_uffd_wp on device-private PMD downgrade
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-15T05:53:43.718Z

Reserved: 2026-08-09T03:40:39.910Z

Link: CVE-2026-72180

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-15T06:21:36.293

Modified: 2026-08-15T06:21:36.293

Link: CVE-2026-72180

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-15T20:00:08Z

Weaknesses