Use-after-free in Linux kernel - CVE-2021-47300
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90097
CSH Severity: Low
CVSS v4: 8.5 [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]
CVE-ID: CVE-2021-47300
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the kernel/bpf/verifier.c. A local user can escalate privileges on the system.
Affected software
Linux kernel
How to mitigate CVE-2021-47300
Install update from vendor's website.
Linux kernel - addressed in versions 5.10.54, 5.13.6, 5.14
External References
- https://git.kernel.org/stable/c/39f1735c8107ef43a53c4daf82f330d880488d8f
- https://git.kernel.org/stable/c/cbb086074dab631ac43f8645cbac1d7b148e05c4
- https://git.kernel.org/stable/c/5dd0a6b8582ffbfa88351949d50eccd5b6694ade
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.54
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.6
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14