Improper locking in Linux kernel - CVE-2025-39905

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Main Vulnerability Database Vulnerabilities #VU116237

Improper locking in Linux kernel - CVE-2025-39905

Published: October 1, 2025


Vulnerability identifier: #VU116237
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-39905
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper locking within the phylink_resolve(), phylink_create(), phylink_bringup_phy() and phylink_disconnect_phy() functions in drivers/net/phy/phylink.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
kernel (Red Hat package)

How to mitigate CVE-2025-39905

Install update from vendor's repository.

kernel (Red Hat package) - update to 6.12.0-124.27.1.el10_1

External References

Related Security Bulletins