Use-after-free in Linux kernel - CVE-2021-47517
Published: May 30, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90053
CSH Severity: Low
CVSS v4.0: 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-2021-47517
CWE-ID: CWE-416
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 escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the ethnl_ops_begin() function in net/ethtool/netlink.h. A local user can escalate privileges on the system.
How to mitigate CVE-2021-47517
Install update from vendor's website.
Sources
- https://git.kernel.org/stable/c/7c26da3be1e9843a15b5318f90db8a564479d2ac
- https://git.kernel.org/stable/c/cfd719f04267108f5f5bf802b9d7de69e99a99f9
- https://git.kernel.org/stable/c/dde91ccfa25fd58f64c397d91b81a4b393100ffa
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.87
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.8
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16