#VU106589 Use-after-free in Linux kernel - CVE-2025-21915

Vulnerability identifier: #VU106589

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-21915

CWE-ID: CWE-416

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 escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the driver_override_show() function in drivers/cdx/cdx.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.6 - 6.6.82

---

External links
https://git.kernel.org/stable/c/0439d541aa8d3444ad41c39e39eb71acb57acde3
https://git.kernel.org/stable/c/8473135f89c0949436a22adb05b8cece2fb3da91
https://git.kernel.org/stable/c/91d44c1afc61a2fec37a9c7a3485368309391e0b
https://git.kernel.org/stable/c/d7b339bbc887bcfc1a5b620bfc70c6fbb8f733bf
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.83

---

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?