Improper privilege management in Linux kernel - CVE-2021-47491
Published: July 3, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU93735
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-47491
CWE-ID: CWE-269
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to read and manipulate data.
The vulnerability exists due to improperly imposed permissions within the hugepage_vma_check() function in mm/khugepaged.c. A local user can read and manipulate data.
How to mitigate CVE-2021-47491
Install update from vendor's website.
Sources
- https://git.kernel.org/stable/c/6d67b2a73b8e3a079c355bab3c1aef7d85a044b8
- https://git.kernel.org/stable/c/5fcb6fce74ffa614d964667110cf1a516c48c6d9
- https://git.kernel.org/stable/c/a4aeaa06d45e90f9b279f0b09de84bd00006e733
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.78
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.16
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15