PT-2025-39129 · Linux+2 · Linux Kernel+2

Published 2025-09-05 · Updated 2026-03-13 · CVE-2025-39872

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 flaw exists in the Linux kernel related to resource handling within the hsr subsystem. Specifically, the hsr get port ndev function does not properly manage locks, potentially leading to a use-after-free condition. The function calls hsr for each port, which requires a read-copy-update (RCU) lock, and attempts to hold a device lock before returning the port device. This improper lock management could create a vulnerability in the caller function.

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

Exploit

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2025-13891

CVE-2025-39872

Affected Products

Astra Linux

Debian

Linux Kernel

References · 23

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39872.json · Exploit
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-39872 · Vendor Advisory
• https://git.kernel.org/stable/c/68a6729afd3e8e9a2a32538642ce92b96ccf9b1d · Patch
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-13-CVE-2025-39872 · Vendor Advisory
• https://git.kernel.org/stable/c/847748fc66d08a89135a74e29362a66ba4e3ab15 · Patch
• https://ubuntu.com/security/CVE-2025-39872 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-39872 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-39872 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-39872 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2025-39872 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-39872 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2025-39872 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-13891 · Security Note
• https://twitter.com/CVEnew/status/1970393440614560198 · Twitter Post
• https://lore.kernel.org/linux-cve-announce/2025092300-CVE-2025-39872-5102@gregkh · Note