CVE-2025-38686userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry
- 5.5MediumCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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. [[email protected]: remove extra folio check, per David]
Timeline
ID reserved
By Linux
- 5 months later
· 5 months later
Published
- 8 months later
· 8 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected adef440691bab824e39c1b17382322d195e1fab0 – < bb81c18dbd42650c844e160cafa7cbb20243a96a
- affected adef440691bab824e39c1b17382322d195e1fab0 – < 1202abad7a7ccd28c426d2844771a387b07629a4
- affected adef440691bab824e39c1b17382322d195e1fab0 – < 7f1101a0a181243ad587ececdffc4845f035549f
- affected adef440691bab824e39c1b17382322d195e1fab0 – < aba6faec0103ed8f169be8dce2ead41fcb689446
- affected 6.8
- unaffected < 6.8
- unaffected 6.12.43 – ≤ 6.12.*
- unaffected 6.15.11 – ≤ 6.15.*
- unaffected 6.16.2 – ≤ 6.16.*
- unaffected 6.17 – ≤ *
References
References4
- https://git.kernel.org/stable/c/bb81c18dbd42650c844e160cafa7cbb20243a96a (opens in a new tab)
- https://git.kernel.org/stable/c/1202abad7a7ccd28c426d2844771a387b07629a4 (opens in a new tab)
- https://git.kernel.org/stable/c/7f1101a0a181243ad587ececdffc4845f035549f (opens in a new tab)
- https://git.kernel.org/stable/c/aba6faec0103ed8f169be8dce2ead41fcb689446 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-26783 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-38686)Record last updated .