Improper locking in Linux kernel stmicro stmmac driver

1) Improper locking

EUVDB-ID: #VU103130

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 - Improper Locking

Exploit availability: No

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: 6.12 - 6.12.9

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:6.12:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.12.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.12.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.12.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.12.4:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.12.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.12.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.12.7:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.12.8:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.12.9:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/235419f0956e8c60e597aa1619ded8bda7460bb4
https://git.kernel.org/stable/c/426046e2d62dd19533808661e912b8e8a9eaec16
https://git.kernel.org/stable/c/b04d33cdbc958a3fd57f3544d4f78b99d9d11909
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.10

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.