PT-2025-51634 · Linux+2 · Linux Kernel+2

Published 2025-12-16 · Updated 2026-04-06 · CVE-2025-68221

Positive Technologies (AI Summary)

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

Description A flaw exists in the Linux kernel’s MPTCP implementation related to address removal logic within the mptcp pm nl rm addr function. The issue stems from an inverted condition in a WARN ON ONCE statement, which prevented correct updates to the address removal counter. Specifically, the decrement logic was only executed when the counter was already zero, an abnormal state, while normal removals were ignored.

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

Exploit

Related Identifiers

CVE-2025-68221

USN-8094-1

USN-8094-2

USN-8094-3

USN-8094-4

USN-8094-5

USN-8152-1

Affected Products

Linuxmint

Linux Kernel

Ubuntu

References · 210

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68221.json · Exploit
• https://ubuntu.com/security/CVE-2025-68227 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-71128 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68222 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8152-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40260 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23060 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68742 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40254 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68283 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68751 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68220 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68362 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40255 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68738 · Vendor Advisory