CVE-2026-72180

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.

Status

Received - 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-08-15

Last modified

2026-08-17

Affected products

• Linux Kernel (Linux)

References

• https://git.kernel.org/stable/c/2611f7521c6c124b1bef1be4fc319e0ca144502f
• https://git.kernel.org/stable/c/f7e2c21bd1f57cd5350eecdfdb5d6025ca6afbab