Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 368076f52ebeecd33e10a9f80905d7508b6b6149 before 2611f7521c6c124b1bef1be4fc319e0ca144502f; affected 368076f52ebeecd33e10a9f80905d7508b6b6149 before f7e2c21bd1f57cd5350eecdfdb5d6025ca6afbab |
| Linux / Linux | affected 6.19; unaffected 0 before 6.19; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.