PT-2025-39144 · Linux+1 · Linux Kernel+1

Published 2025-09-06 · Updated 2025-09-23 · CVE-2025-39887

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 versions 6.17.0-rc4-00201-gd69eb204c255 and earlier

Description A flaw exists in the Linux kernel's tracing/osnoise module, specifically within the bitmap parselist() function. A null pointer dereference can occur when the count parameter is set to 0 in the osnoise cpus write() function, leading to a kernel crash. The issue arises because kmalloc() returns a null pointer in this scenario, which is then incorrectly processed by cpulist parse(). The vulnerability can be triggered by writing "0-2" to the /sys/kernel/debug/tracing/osnoise/cpus file.

Recommendations Update the Linux kernel to a version beyond 6.17.0-rc4-00201-gd69eb204c255.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BDU:2025-13901

CVE-2025-39887

Affected Products

Astra Linux

Linux Kernel

References · 18

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39887.json · Exploit
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-39887 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-39887 · Vendor Advisory
• https://git.kernel.org/stable/c/c1628c00c4351dd0727ef7f670694f68d9e663d8 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2025-39887 · Security Note
• https://osv.dev/vulnerability/CVE-2025-39887 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-39887 · Vendor Advisory
• https://git.kernel.org/stable/c/e33228a2cc7ff706ca88533464e8a3b525b961ed · Patch
• https://bdu.fstec.ru/vul/2025-13901 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2025-39887 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-39887 · Security Note
• https://git.kernel.org/linus/c1628c00c4351dd0727ef7f670694f68d9e663d8 · Note
• https://cybersecurity-help.cz/vdb/SB2025092373 · Note
• https://lore.kernel.org/linux-cve-announce/2025092302-CVE-2025-39887-12f0@gregkh · Note
• https://t.me/CVEtracker/33142 · Telegram Post