Improper locking in Linux kernel - CVE-2021-47392
Published: June 3, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90743
CSH Severity: Low
CVSS v4.0: 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-2021-47392
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the cma_cancel_route(), cma_cancel_listens() and cma_listen_on_all() functions in drivers/infiniband/core/cma.c. A local user can perform a denial of service (DoS) attack.
How to mitigate CVE-2021-47392
Install update from vendor's website.
Sources
- https://git.kernel.org/stable/c/3f4e68902d2e545033c80d7ad62fd9a439e573f4
- https://git.kernel.org/stable/c/e56a5146ef8cb51cd7c9e748267dce7564448a35
- https://git.kernel.org/stable/c/ca465e1f1f9b38fe916a36f7d80c5d25f2337c81
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.71
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.10
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15