Use-after-free in Linux kernel - CVE-2021-47306
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90096
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-47306
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the release_mem_region() function in drivers/net/fddi/defza.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
External links
- https://git.kernel.org/stable/c/04b06716838bfc26742dbed3ae1d3697fe5317ee
- https://git.kernel.org/stable/c/f33605908a9b6063525e9f68e62d739948c5fccf
- https://git.kernel.org/stable/c/bdfbb51f7a437ae8ea91317a5c133ec13adf3c47
- https://git.kernel.org/stable/c/deb7178eb940e2c5caca1b1db084a69b2e59b4c9
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.53
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.5
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.135