CVE-2025-38686
BaseFortify
Publication date: 2025-09-04
Last updated on: 2025-11-24
Assigner: kernel.org
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | 6.17 |
| linux | linux_kernel | From 5.15.160 (inc) to 5.16 (inc) |
| linux | linux_kernel | From 5.15.160 (inc) to 5.16 (inc) |
| linux | linux_kernel | From 5.15.160 (inc) to 5.16 (inc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-NVD-CWE-noinfo |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability occurs in the Linux kernel's userfaultfd feature, specifically in the UFFDIO_MOVE operation. When UFFDIO_MOVE encounters a migration Page Middle Directory (PMD) entry, it incorrectly tries to obtain and access a folio even though the entry is of type swp_entry_t (a swap entry). The fix involves adding a missing check to properly handle migration entries by letting the split_huge_pmd() function manage them, and removing an unnecessary folio check to prevent a crash.
How can this vulnerability impact me? :
This vulnerability can cause the Linux kernel to crash when the UFFDIO_MOVE operation encounters a migration PMD entry without the proper checks. Such a crash can lead to system instability or denial of service, potentially disrupting normal operations on affected systems.