PT-2026-2555 · Linux+2 · Linux Kernel+2

Published 2026-01-13 · Updated 2026-06-16 · CVE-2025-68823

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 deadlock situation can occur when a process, such as udev, opens a ublk block device to read the partition table. This happens because of a circular dependency involving mutex locks. Specifically, the process acquires a disk mutex, issues a read I/O request, and then a callback function may trigger a file descriptor release, which attempts to reacquire the same mutex, leading to a deadlock. The issue is resolved by ensuring that certain request handling functions run with bottom halves disabled, forcing the release operation to occur in a different context and preventing the deadlock.

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

CVE-2025-68823

ECHO-BF30-1B68-DDE0

USN-8177-1

USN-8177-2

USN-8183-1

USN-8183-2

USN-8245-1

USN-8257-1

USN-8278-1

USN-8278-2

USN-8289-1

USN-8289-2

USN-8296-1

USN-8296-2

USN-8393-1

USN-8440-1

Affected Products

Linuxmint

Linux Kernel

Ubuntu

References · 473

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68823.json · Exploit
• https://ubuntu.com/security/CVE-2026-46000 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23088 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-71080 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-71101 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68773 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68744 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68372 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23001 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68808 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68813 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8177-2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-71075 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-46323 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23206 · Vendor Advisory