CVE-2025-38686

MediumCVSS 5.5/10Last modified Oct 19, 2026

Description

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.

[surenb@google.com: remove extra folio check, per David]

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected software

VendorProductVersions
LinuxLinux>= adef440691bab824e39c1b17382322d195e1fab0, < bb81c18dbd42650c844e160cafa7cbb20243a96a; >= adef440691bab824e39c1b17382322d195e1fab0, < 1202abad7a7ccd28c426d2844771a387b07629a4; >= adef440691bab824e39c1b17382322d195e1fab0, < 7f1101a0a181243ad587ececdffc4845f035549f; >= adef440691bab824e39c1b17382322d195e1fab0, < aba6faec0103ed8f169be8dce2ead41fcb689446
LinuxLinux6.8

References

Timeline

Published
Sep 4, 2025
Last modified
Oct 19, 2026
NVD status
Analyzed

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CVE-2025-38686: Medium severity, CVSS 5.5 | Vulnix