PT-2025-43617 · Linux+3 · Linux Kernel+3

Published 2025-09-24 · Updated 2026-05-07 · CVE-2025-40021

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 has an issue where the dynamic events interface on tracefs does not check the lockdown status, potentially allowing unauthorized access. This interface is compatible with kprobe events and uprobe events, and should also enforce lockdown restrictions.

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

Exploit

Weakness Enumeration

CWE-371

Related Identifiers

AZL-68811

BDU:2026-02700

CVE-2025-40021

DLA-4379-1

DLA-4404-1

DSA-6053-1

ECHO-0FC4-6C09-043E

MGASA-2025-0309

MGASA-2025-0310

OESA-2025-2632

OESA-2025-2633

OESA-2025-2634

OESA-2025-2635

OESA-2025-2636

OPENSUSE-SU-2025:20172-1

SUSE-SU-2025:4393-1

SUSE-SU-2025:4422-1

SUSE-SU-2025:4505-1

SUSE-SU-2025:4516-1

SUSE-SU-2025:4517-1

SUSE-SU-2025:4521-1

SUSE-SU-2026:20012-1

SUSE-SU-2026:20015-1

SUSE-SU-2026:20021-1

SUSE-SU-2026:20039-1

SUSE-SU-2026:20059-1

SUSE-SU-2026:20473-1

SUSE-SU-2026:20496-1

USN-8033-1

USN-8033-2

USN-8033-3

USN-8033-4

USN-8033-5

USN-8033-6

USN-8033-7

USN-8033-8

USN-8034-1

USN-8034-2

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-8141-1

USN-8163-1

USN-8163-2

USN-8165-1

USN-8243-1

USN-8261-1

Affected Products

Debian

Linuxmint

Linux Kernel

Ubuntu

References · 1895

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40021.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-2026-23026 · Vendor Advisory
• 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