Vulnerability identifier: #VU90913

Vulnerability risk: Low

CVSSv3.1: 4.8 [AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47091

CWE-ID: CWE-617

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 reachable assertion within the ieee80211_start_ap() function in net/mac80211/cfg.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
http://git.kernel.org/stable/c/ac61b9c6c0549aaeb98194cf429d93c41bfe5f79
http://git.kernel.org/stable/c/c1d1ec4db5f7264cfc21993e59e8f2dcecf4b44f
http://git.kernel.org/stable/c/87a270625a89fc841f1a7e21aae6176543d8385c

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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.