PT-2025-51695 · Linux+3 · Linux Kernel+3

Published 2025-11-27 · Updated 2026-05-11 · CVE-2025-68291

Positive Technologies (AI Summary)

CVSS v2.0

4.6

Medium

Base vector

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

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

Description The Linux kernel contained a flaw within the MPTCP implementation. Specifically, the rcv mss was not initialized before being used in the tcp send active reset() function within mptcp do fastclose(). This led to a divide-by-zero error, as reported by syzbot, potentially causing system instability. The issue was similar to a previously fixed problem in the base TCP implementation. The error occurred during MPTCP socket operations.

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

Exploit

Weakness Enumeration

CWE-909

Related Identifiers

AZL-74172

BDU:2026-01359

CVE-2025-68291

ECHO-29EB-1339-5CAA

MGASA-2026-0017

MGASA-2026-0018

OESA-2026-1946

OESA-2026-1947

OESA-2026-1948

OESA-2026-1949

USN-8179-1

USN-8179-2

USN-8179-3

USN-8179-4

USN-8184-1

USN-8185-1

USN-8185-2

USN-8203-1

USN-8204-1

USN-8258-1

USN-8260-1

USN-8265-1

Affected Products

Debian

Linuxmint

Linux Kernel

Ubuntu

References · 261

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68291.json · Exploit
• https://ubuntu.com/security/CVE-2025-68757 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8179-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68783 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23231 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8260-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68759 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68806 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68817 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-71154 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-71132 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-71130 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8265-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68821 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68366 · Vendor Advisory