CVE-2025-38686

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]

CVSS 3.1

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

EPSS

0.2% chance of exploitation in the next 30 days; higher than 5% of CVEs (scores of 2026-10-25)

Published

2025-09-04

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/1202abad7a7ccd28c426d2844771a387b07629a4
• https://git.kernel.org/stable/c/7f1101a0a181243ad587ececdffc4845f035549f
• https://git.kernel.org/stable/c/aba6faec0103ed8f169be8dce2ead41fcb689446
• https://git.kernel.org/stable/c/bb81c18dbd42650c844e160cafa7cbb20243a96a

Check your stackJSON