#VU103749 Improper locking in Linux kernel - CVE-2025-21684

Vulnerability identifier: #VU103749

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:U/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-21684

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 DECLARE_BITMAP(), xgpio_set(), xgpio_set_multiple(), xgpio_dir_in(), xgpio_dir_out(), xgpio_irq_mask(), xgpio_irq_unmask(), xgpio_irqhandler() and xgpio_probe() functions in drivers/gpio/gpio-xilinx.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

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External links
https://git.kernel.org/stable/c/9860370c2172704b6b4f0075a0c2a29fd84af96a
https://git.kernel.org/stable/c/9c035105c5537d2ecad6b9415e9417a1ffbd0a62
https://git.kernel.org/stable/c/b0111650ee596219bb5defa0ce1a1308e6e77ccf

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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.