#VU91442 Improper locking in Linux kernel - CVE-2021-47494
Published: June 8, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU91442
Vulnerability risk: Low
CVSSv4.0: 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
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
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.
Remediation
Install update from vendor's website.
External links
- https://git.kernel.org/stable/c/4c22227e39c7a0b4dab55617ee8d34d171fab8d4
- https://git.kernel.org/stable/c/3c897f39b71fe68f90599f6a45b5f7bf5618420e
- https://git.kernel.org/stable/c/09b1d5dc6ce1c9151777f6c4e128a59457704c97
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.77
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.16
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15