NULL pointer dereference in Linux kernel - CVE-2021-47218
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90585
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-2021-47218
CWE-ID: CWE-476
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 NULL pointer dereference within the hashtab_compute_size() function in security/selinux/ss/hashtab.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/b17dd53cac769dd13031b0ca34f90cc65e523fab
- https://git.kernel.org/stable/c/83c8ab8503adf56bf68dafc7a382f4946c87da79
- https://git.kernel.org/stable/c/dc27f3c5d10c58069672215787a96b4fae01818b
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.82
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.5
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16