NULL pointer dereference in Linux kernel - CVE-2021-46912
Published: June 1, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90652
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2021-46912
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the ipv4_sysctl_init_net() function in net/ipv4/sysctl_net_ipv4.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
How to mitigate CVE-2021-46912
Install update from vendor's website.
Linux kernel - addressed in versions 5.10.32, 5.11.16, 5.12
External References
- https://git.kernel.org/stable/c/35d7491e2f77ce480097cabcaf93ed409e916e12
- https://git.kernel.org/stable/c/1ccdf1bed140820240e383ba0accc474ffc7f006
- https://git.kernel.org/stable/c/97684f0970f6e112926de631fdd98d9693c7e5c1
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.32
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.16
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12