Release of invalid pointer or reference in Linux kernel - CVE-2021-47087
Published: June 21, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU93003
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-47087
CWE-ID: CWE-763
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 modify data on the system.
The vulnerability exists due to performance of perform __free_pages(page, order) using this pointer as we would free any arbitrary pages. A local user can modify data on the system.
How to mitigate CVE-2021-47087
Install updates from vendor's website.
Sources
- https://git.kernel.org/stable/c/806142c805cacd098e61bdc0f72c778a2389fe4a
- https://git.kernel.org/stable/c/ad338d825e3f7b96ee542bf313728af2d19fe9ad
- https://git.kernel.org/stable/c/91e94e42f6fc49635f1a16d8ae3f79552bcfda29
- https://git.kernel.org/stable/c/18549bf4b21c739a9def39f27dcac53e27286ab5
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.89
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.12
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.169