PT-2025-44383 · Linux+3 · Linux Kernel+3

Published 2025-09-17 · Updated 2026-05-07 · CVE-2025-40093

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 USB gadget functionality, specifically within the f ecm module. After a bind/unbind cycle, the ecm->notify req variable can become stale. A subsequent bind failure then attempts to free this stale request, resulting in a NULL pointer dereference when accessing ep->ops->free request. The issue is addressed by refactoring the error handling in the bind path to utilize the free() automatic cleanup mechanism.

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

Exploit

NULL Pointer Dereference

Improper Resource Release

Weakness Enumeration

CWE-476

CWE-404

Related Identifiers

BDU:2026-02693

CVE-2025-40093

DLA-4379-1

DSA-6053-1

ECHO-D9DA-585E-3FD4

MGASA-2025-0309

MGASA-2025-0310

OPENSUSE-SU-2025:15702-1

OPENSUSE-SU-2026:10301-1

USN-8029-1

USN-8029-2

USN-8029-3

USN-8030-1

USN-8048-1

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-8165-1

USN-8261-1

Affected Products

Debian

Linuxmint

Linux Kernel

Ubuntu

References · 1796

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40093.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-2025-68319 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38543 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40098 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38702 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8030-1 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2025-0309.html · Security Note
• https://ubuntu.com/security/CVE-2025-40359 · Vendor Advisory