CVE-2025-38686

low-risk
Published 2025-09-04

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]

Do I need to act?

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0.02% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (2)

Affected Vendors

Linux

References (4)

Patch https://git.kernel.org/stable/c/1202abad7a7ccd28c426d2844771a387b07629a4
Patch https://git.kernel.org/stable/c/7f1101a0a181243ad587ececdffc4845f035549f
Patch https://git.kernel.org/stable/c/aba6faec0103ed8f169be8dce2ead41fcb689446
Patch https://git.kernel.org/stable/c/bb81c18dbd42650c844e160cafa7cbb20243a96a
25
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 7/34 · Low