PT-2025-35959 · Linux+5 · Linux Kernel+5

Published 2025-08-06 · Updated 2026-04-20 · CVE-2025-38686

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw exists in the Linux kernel related to userfaultfd. Specifically, a crash can occur in the UFFDIO MOVE operation when a Page Middle Directory (PMD) is a migration entry. The issue arises from attempting to obtain and access a folio even when the entry is a swap entry (swp entry t). The fix involves adding a check to handle migration entries correctly and removing an unnecessary folio check.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2025-15549

CVE-2025-38686

OPENSUSE-SU-2025:20081-1

SUSE-SU-2025:21074-1

SUSE-SU-2025:21139-1

SUSE-SU-2025:21179-1

USN-8028-1

USN-8028-2

USN-8028-3

USN-8028-4

USN-8028-5

USN-8028-6

USN-8028-7

USN-8028-8

USN-8031-1

USN-8031-2

USN-8031-3

USN-8052-1

USN-8052-2

USN-8074-1

USN-8074-2

USN-8126-1

Affected Products

Astra Linux

Linuxmint

Linux Kernel

Red Os

Suse

Ubuntu

References · 2489

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38686.json · Exploit
• https://ubuntu.com/security/CVE-2025-38145 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40238 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38714 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40169 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40105 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40070 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38474 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-37828 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38090 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40127 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-38686 · Security Note
• https://ubuntu.com/security/CVE-2025-38117 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68222 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40281 · Vendor Advisory