Improper locking in Linux kernel ethernet renesas driver

1) Improper locking

EUVDB-ID: #VU105143

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-2025-21801

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 ravb_suspend() and ravb_resume() functions in drivers/net/ethernet/renesas/ravb_main.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.13 - 6.13.1

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:6.13:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.13.1:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/0296981941cf291edfbc318d3255a93439f368e4
https://git.kernel.org/stable/c/2c2ebb2b49573e5f8726112ad06b1dffc3c9ea03
https://git.kernel.org/stable/c/ad19522c007bb24ed874468f8baa1503c4662cf4
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.2

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.