#VU106594 Use-after-free in Linux kernel - CVE-2025-21923

Vulnerability identifier: #VU106594

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-2025-21923

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 steam_remove() function in drivers/hid/hid-steam.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.13, 6.13.1, 6.13.2, 6.13.3, 6.13.4, 6.13.5, 6.13.6

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External links
https://git.kernel.org/stable/c/026714ec7546de741826324a6a1914c91024d06c
https://git.kernel.org/stable/c/a899adf7063c6745aaff1ec869f3c7f6329ed0a1
https://git.kernel.org/stable/c/e53fc232a65f7488ab75d03a5b95f06aaada7262
https://git.kernel.org/stable/c/ea3f18d2f02629653b7bfe42607737ccd1343e54
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.7

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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.