#VU103130 Improper locking in Linux kernel - CVE-2025-21663

Vulnerability identifier: #VU103130

Vulnerability risk: Low

CVSSv4.0: 4.3 [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/E:U/U:Clear]

CVE-ID: CVE-2025-21663

CWE-ID: CWE-667

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

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

The vulnerability exists due to improper locking within the MAC_SBD_INTR BIT(), tegra_mgbe_resume() and tegra_mgbe_probe() functions in drivers/net/ethernet/stmicro/stmmac/dwmac-tegra.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

---

External links
https://git.kernel.org/stable/c/235419f0956e8c60e597aa1619ded8bda7460bb4
https://git.kernel.org/stable/c/426046e2d62dd19533808661e912b8e8a9eaec16
https://git.kernel.org/stable/c/b04d33cdbc958a3fd57f3544d4f78b99d9d11909

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.