PT-2025-14336 · Linux+4 · Linux Kernel+4

Published 2025-03-10 · Updated 2026-05-26 · CVE-2025-21955

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 vulnerability in the Linux kernel has been resolved, specifically in the ksmbd component. The issue involved the potential freeing of ksmbd work after connection release during oplock break notification. To address this, the r count of ksmbd conn is incremented to indicate that requests are not finished yet and to prevent the connection from being released.

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

Exploit

Weakness Enumeration

CWE-911

Related Identifiers

BDU:2026-01412

CVE-2025-21955

ECHO-E1B6-BB6D-F9D9

MGASA-2025-0142

MGASA-2025-0146

OESA-2025-2120

OESA-2025-2121

OESA-2025-2122

USN-7605-1

USN-7605-2

USN-7606-1

USN-7628-1

USN-7764-1

USN-7764-2

USN-7765-1

USN-7766-1

USN-7767-1

USN-7767-2

USN-7779-1

USN-7790-1

USN-7800-1

USN-7801-1

USN-7801-2

USN-7801-3

USN-7802-1

USN-7809-1

Affected Products

Astra Linux

Debian

Linuxmint

Linux Kernel

Ubuntu

References · 367

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21955.json · Exploit
• https://ubuntu.com/security/CVE-2025-22009 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-22083 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-22072 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-22025 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-53034 · Vendor Advisory
• https://osv.dev/vulnerability/USN-7802-1 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2025-20530.html · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-22022 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-22064 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-21955 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-37959 · Security Note
• https://ubuntu.com/security/CVE-2025-21899 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-37752 · Security Note
• https://ubuntu.com/security/CVE-2025-22079 · Vendor Advisory