Improper locking in Linux kernel - CVE-2021-47451
Published: June 13, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU92011
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-2021-47451
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 idletimer_tg_create() function in net/netfilter/xt_IDLETIMER.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/2a670c323055282c9b72794a491d53cef86bbeaf
- https://git.kernel.org/stable/c/cae7cab804c943d723d52724a3aeb07a3f4a2650
- https://git.kernel.org/stable/c/902c0b1887522a099aa4e1e6b4b476c2fe5dd13e
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.76
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.15
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15