#VU103132 Use of uninitialized resource in Linux kernel - CVE-2025-21656

Vulnerability identifier: #VU103132

Vulnerability 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-2025-21656

CWE-ID: CWE-908

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 use of uninitialized resource within the drivetemp_scsi_command() function in drivers/hwmon/drivetemp.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

---

External links
https://git.kernel.org/stable/c/42268d885e44af875a6474f7bba519cc6cea6a9d
https://git.kernel.org/stable/c/53e25b10a28edaf8c2a1d3916fd8929501a50dfc
https://git.kernel.org/stable/c/82163d63ae7a4c36142cd252388737205bb7e4b9

---

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.