#VU106847 Race condition in Linux kernel - CVE-2025-21947

Vulnerability identifier: #VU106847

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-2025-21947

CWE-ID: CWE-362

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 race condition within the handle_response() function in fs/smb/server/transport_ipc.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.1 - 6.1.130, 6.6 - 6.6.82, 6.12 - 6.12.18, 6.13 - 6.13.6

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External links
https://git.kernel.org/stable/c/1e8833c03a38e1d5d5df6484e3f670a2fd38fb76
https://git.kernel.org/stable/c/3cb2b2e41541fe6f9cc55ca22d4c0bd260498aea
https://git.kernel.org/stable/c/6321bbda4244b93802d61cfe0887883aae322f4b
https://git.kernel.org/stable/c/76861630b29e51373e73e7b00ad0d467b6941162
https://git.kernel.org/stable/c/e2ff19f0b7a30e03516e6eb73b948e27a55bc9d2
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.131
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.19
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.7
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.14
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.83

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?