Improper locking in Linux kernel - CVE-2021-47038
Published: June 3, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90806
CSH Severity: 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-2021-47038
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 hci_conn_get_phy() function in net/bluetooth/hci_conn.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/7cc0ba67883c6c8d3bddb283f56c167fc837a555
- https://git.kernel.org/stable/c/fee71f480bc1dec5f6ae3b0b185ff12a62bceabc
- https://git.kernel.org/stable/c/332e69eb3bd90370f2d9f2c2ca7974ff523dea17
- https://git.kernel.org/stable/c/17486960d79b900c45e0bb8fbcac0262848582ba
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.37
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.21
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.4
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13