PT-2026-2518 · Linux+2 · Linux Kernel+2

Published 2025-11-09 · Updated 2026-05-11 · CVE-2025-68786

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 A flaw exists in the Linux kernel’s ksmbd module where a size underflow can occur during a lock-range check when the size equals the current file size, including zero. This happens because the code calculates size - 1, which can underflow if size is zero. The issue is addressed by skipping the equal size case.

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

Exploit

Improper Locking

Weakness Enumeration

CWE-667

Related Identifiers

BDU:2026-00743

CVE-2025-68786

ECHO-0719-1D46-A7C8

MGASA-2026-0017

MGASA-2026-0018

USN-8177-1

USN-8177-2

USN-8179-1

USN-8179-2

USN-8179-3

USN-8179-4

USN-8183-1

USN-8183-2

USN-8184-1

USN-8185-1

USN-8185-2

USN-8203-1

USN-8204-1

USN-8245-1

USN-8257-1

USN-8258-1

USN-8260-1

USN-8261-1

USN-8265-1

Affected Products

Linuxmint

Linux Kernel

Ubuntu

References · 720

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68786.json · Exploit
• https://ubuntu.com/security/CVE-2025-71095 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40035 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68244 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68340 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68745 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40321 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-39869 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23408 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-71121 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68777 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-71117 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-23129 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8261-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-22124 · Vendor Advisory