#VU105000 NULL pointer dereference in Linux kernel - CVE-2025-21744

Vulnerability identifier: #VU105000

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-2025-21744

CWE-ID: CWE-476

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 NULL pointer dereference within the brcmf_txfinalize() function in drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.12 - 6.12.13

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External links
https://git.kernel.org/stable/c/3877fc67bd3d5566cc12763bce39710ceb74a97d
https://git.kernel.org/stable/c/4e51d6d093e763348916e69d06d87e0a5593661b
https://git.kernel.org/stable/c/68abd0c4ebf24cd499841a488b97a6873d5efabb
https://git.kernel.org/stable/c/a2beefc4fa49ebc22e664dc6b39dbd054f8488f9
https://git.kernel.org/stable/c/fbbfef2a5b858eab55741a58b2ac9a0cc8d53c58
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.14

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?