#VU105042 Use of uninitialized resource in Linux kernel - CVE-2025-21707

Vulnerability identifier: #VU105042

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-2025-21707

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 mptcp_parse_option() and mptcp_get_options() functions in net/mptcp/options.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/3b5332d416d151a15742d1b16e7319368e3cc5c6
https://git.kernel.org/stable/c/6169e942370b4b6f9442d35c51519bf6c346843b
https://git.kernel.org/stable/c/7f6c72b8ef8130760710e337dc8fbe7263954884
https://git.kernel.org/stable/c/ba0518f9e8688cd4fcb569e8df2a74874b4f3894
https://git.kernel.org/stable/c/c86b000782daba926c627d2fa00c3f60a75e7472

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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.