PT-2025-40638 · Linux+3 · Linux Kernel+3

Published 2025-09-14 · Updated 2026-05-07 · CVE-2025-39942

Positive Technologies (AI Summary)

CVSS v2.0

7.7

High

Base vector

AV:A/AC:L/Au:S/C:C/I:C/A:C

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

Description A flaw exists in the Linux kernel's ksmbd component, specifically within the smbdirect functionality. The issue involves insufficient verification of remaining data length against max fragmented recv size. This oversight is related to a check for data offset + data length.

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

Exploit

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

AZL-68139

AZL-75336

BDU:2026-02673

CVE-2025-39942

DLA-4379-1

DSA-6053-1

ECHO-AFAE-4892-4953

MGASA-2025-0309

MGASA-2025-0310

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

Ubuntu

References · 1436

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39942.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://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://advisories.mageia.org/MGASA-2025-0309.html · Security Note
• https://ubuntu.com/security/CVE-2025-40284 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-37927 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38232 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68282 · Vendor Advisory