PT-2025-46621 · Linux+3 · Linux Kernel+3

Published 2025-09-10 · Updated 2026-05-26 · CVE-2025-40146

Positive Technologies (AI Summary)

CVSS v2.0

4.9

Medium

Base vector

AV:L/AC:L/Au:N/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 blk-mq subsystem related to memory allocation. Specifically, allocating and freeing sched tags while a queue is frozen can lead to a deadlock. The issue arises from a long-term problem where memory is allocated before freezing the queue and freed after it is unfrozen, resolving a potential deadlock scenario.

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

Exploit

Weakness Enumeration

CWE-833

Related Identifiers

AZL-70004

BDU:2025-15294

CVE-2025-40146

ECHO-D58F-A972-E840

USN-8029-1

USN-8029-2

USN-8029-3

USN-8030-1

USN-8048-1

Affected Products

Debian

Linuxmint

Linux Kernel

Ubuntu

References · 404

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40146.json · Exploit
• https://ubuntu.com/security/CVE-2025-40223 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40333 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68209 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40294 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-40146 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40040 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68311 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-40146 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40106 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40341 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40122 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68183 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40297 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40285 · Vendor Advisory