Use-after-free in Linux kernel - CVE-2021-47402
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90142
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-2021-47402
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 fl_walk() function in net/sched/cls_flower.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/694b0cee7f8546b69a80996a29cb3cf4149c0453
- https://git.kernel.org/stable/c/d0d520c19e7ea19ed38dc5797b12397b6ccf9f88
- https://git.kernel.org/stable/c/dab4677bdbffa5c8270e79e34e51c89efa0728a0
- https://git.kernel.org/stable/c/d5ef190693a7d76c5c192d108e8dec48307b46ee
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.71
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.10
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.151