#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: 5.15 - 5.15.178, 6.1 - 6.1.128, 6.6 - 6.6.75, 6.12 - 6.12.12, 6.13 - 6.13.1

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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
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.179
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.129
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.13
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.2
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.14
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.76

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?