#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: All versions

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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

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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.