Improper locking in Linux kernel net

1) Improper locking

EUVDB-ID: #VU91442

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-2021-47494

CWE-ID: CWE-667 - Improper Locking

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper locking within the cfg80211_mgmt_registrations_update(), cfg80211_mlme_register_mgmt(), cfg80211_mlme_unregister_socket() and cfg80211_rx_mgmt_khz() functions in net/wireless/mlme.c, within the INIT_WORK() and cfg80211_init_wdev() functions in net/wireless/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

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:*:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4
https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420e
https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97

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.