PT-2025-40626 · Linux+4 · Linux Kernel+4

Published 2025-09-18 · Updated 2026-05-07 · CVE-2025-39929

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 memory leak exists in the SMB client within the Linux kernel, specifically within the smbd negotiate() function's error handling path. The leak occurs due to objects remaining on kmem cache shutdown(). This issue was identified during testing of an unrelated patch.

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

Exploit

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

AZL-68132

AZL-75321

BDU:2026-02677

CVE-2025-39929

DLA-4379-1

DSA-6053-1

ECHO-B1C4-D094-9AA4

MGASA-2025-0309

MGASA-2025-0310

OESA-2026-1303

OESA-2026-1304

OESA-2026-1305

SUSE-SU-2025:4189-1

USN-8095-1

USN-8095-2

USN-8095-3

USN-8095-4

USN-8095-5

USN-8100-1

USN-8125-1

USN-8126-1

USN-8165-1

USN-8261-1

Affected Products

Debian

Linuxmint

Linux Kernel

Suse

Ubuntu

References · 1834

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39929.json · Exploit
• https://ubuntu.com/security/CVE-2025-40269 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38055 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40092 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21833 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-68218 · Security Note
• https://ubuntu.com/security/CVE-2025-39788 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40030 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38251 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38543 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38702 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-40252 · Security Note
• https://advisories.mageia.org/MGASA-2025-0309.html · Security Note
• https://ubuntu.com/security/CVE-2025-40284 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2025-39929 · Vendor Advisory