Input validation error in Linux kernel - CVE-2021-46945
Published: July 2, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU93695
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-2021-46945
CWE-ID: CWE-20
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 improper input validation within the ext4_handle_error() function in fs/ext4/super.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
How to mitigate CVE-2021-46945
Install update from vendor's website.
Linux kernel - addressed in versions 5.11.20, 5.12.3, 5.13
External References
- https://git.kernel.org/stable/c/64e1eebe2131183174f4fbb6b1491355f96c6cde
- https://git.kernel.org/stable/c/1e9ea8f4637026b8e965128953f2da061ccae9c4
- https://git.kernel.org/stable/c/ac2f7ca51b0929461ea49918f27c11b680f28995
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.20
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.3
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13