#VU105079 Resource management error in Linux kernel - CVE-2025-21706

Vulnerability identifier: #VU105079

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-2025-21706

CWE-ID: CWE-399

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 resource management error within the mptcp_pm_nl_set_flags() function in net/mptcp/pm_netlink.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/1bb0d1348546ad059f55c93def34e67cb2a034a6
https://git.kernel.org/stable/c/22b0734c9401a74ed4ebd9e8ef0da33e493852eb
https://git.kernel.org/stable/c/8ac344cbd84fda75e05e1f445f7f8fb24dc175e1
https://git.kernel.org/stable/c/9e3d61620a3cd033319553b980ff3a350adbe1bc
https://git.kernel.org/stable/c/de3b8d41d2547452c4cafb146d003fa4689fbaf2

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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.