CVE-2025-38686
userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
In the Linux kernel, the following vulnerability has been resolved: userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry When UFFDIO_MOVE encounters a migration PMD entry, it proceeds with obtaining a folio and accessing it even though the entry is swp_entry_t. Add the missing check and let split_huge_pmd() handle migration entries. While at it also remove unnecessary folio check. [[email protected]: remove extra folio check, per David]
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 4, 2025 |
| Last Updated | May 11, 2026 |
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Affected Versions
Linux / Linux
adef440691bab824e39c1b17382322d195e1fab0 < bb81c18dbd42650c844e160cafa7cbb20243a96a adef440691bab824e39c1b17382322d195e1fab0 < 1202abad7a7ccd28c426d2844771a387b07629a4 adef440691bab824e39c1b17382322d195e1fab0 < 7f1101a0a181243ad587ececdffc4845f035549f adef440691bab824e39c1b17382322d195e1fab0 < aba6faec0103ed8f169be8dce2ead41fcb689446
Linux / Linux
6.8
References
git.kernel.org: https://git.kernel.org/stable/c/bb81c18dbd42650c844e160cafa7cbb20243a96a git.kernel.org: https://git.kernel.org/stable/c/1202abad7a7ccd28c426d2844771a387b07629a4 git.kernel.org: https://git.kernel.org/stable/c/7f1101a0a181243ad587ececdffc4845f035549f git.kernel.org: https://git.kernel.org/stable/c/aba6faec0103ed8f169be8dce2ead41fcb689446