Buffer overflow in Linux kernel - CVE-2021-47221
Published: June 24, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU93145
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-2021-47221
CWE-ID: CWE-119
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 memory corruption within the calculate_sizes() function in mm/slub.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
How to mitigate CVE-2021-47221
Install update from vendor's website.
Linux kernel - addressed in versions 5.10.46, 5.12.13, 5.13
External References
- https://git.kernel.org/stable/c/f6ed2357541612a13a5841b3af4dc32ed984a25f
- https://git.kernel.org/stable/c/ce6e8bee7a3883e8008b30f5887dbb426aac6a35
- https://git.kernel.org/stable/c/e41a49fadbc80b60b48d3c095d9e2ee7ef7c9a8e
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.46
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.13
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13