PT-2025-37204 · Linux+1 · Linux Kernel+1

Published 2025-06-25 · Updated 2026-04-20 · CVE-2025-39745

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:

The Linux kernel contains a flaw within the rcutorture functionality. Specifically, the rcutorture one extend check() function exhibited a splat in kernels built with CONFIG PREEMPT RT=y when running rcutorture tests. This issue stemmed from an incorrect check for disabled bottom halves (BH) in RT kernels, leading to inaccurate preempt count() values. The fix involves utilizing softirq count() to correctly determine if BH is disabled.

Recommendations:

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

Exploit

Weakness Enumeration

CWE-371

CWE-267

Related Identifiers

BDU:2026-01378

CVE-2025-39745

ECHO-89C1-D1ED-611C

Affected Products

Debian

Linux Kernel

References · 25

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39745.json · Exploit
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-13-CVE-2025-39745 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-39745 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-01378 · Security Note
• https://osv.dev/vulnerability/CVE-2025-39745 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-39745 · Security Note
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2025-39745 · Vendor Advisory
• https://git.kernel.org/stable/c/8d71351d88e478d3c4e945e3218e97ec677fd807 · Patch
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-12-CVE-2025-39745 · Vendor Advisory
• https://git.kernel.org/stable/c/69c5ae0f441c2d72e8f48dc1e08464c172360c4c · Patch
• https://osv.dev/vulnerability/BELL-CVE-2025-39745 · Vendor Advisory
• https://git.kernel.org/stable/c/a85550267247cdf5e7499be00ea8e388ab014e50 · Patch
• https://ubuntu.com/security/CVE-2025-39745 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2404-CVE-2025-39745 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-39745 · Vendor Advisory