Use-after-free in Linux kernel - CVE-2021-47162
Published: June 4, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU91064
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-2021-47162
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 tipc_buf_append() function in net/tipc/msg.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/b2c8d28c34b3070407cb1741f9ba3f15d0284b8b
- https://git.kernel.org/stable/c/5489f30bb78ff0dafb4229a69632afc2ba20765c
- https://git.kernel.org/stable/c/436d650d374329a591c30339a91fa5078052ed1e
- https://git.kernel.org/stable/c/4b1761898861117c97066aea6c58f68a7787f0bf
- https://git.kernel.org/stable/c/64d17ec9f1ded042c4b188d15734f33486ed9966
- https://git.kernel.org/stable/c/6da24cfc83ba4f97ea44fc7ae9999a006101755c
- https://git.kernel.org/stable/c/ace300eecbccaa698e2b472843c74a5f33f7dce8
- https://git.kernel.org/stable/c/b7df21cf1b79ab7026f545e7bf837bd5750ac026
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.235
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.193
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.271
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.271
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.42
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.9
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.124