Use-after-free in Linux kernel - CVE-2020-27825
Published: December 11, 2020 / Updated: December 14, 2020
Vulnerability identifier: #VU48967
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2020-27825
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 compromise vulnerable system.
The vulnerability exists due to a use-after-free error in kernel/trace/ring_buffer.c in Linux kernel, when trace_open and resize of cpu buffer are running in parallel on different CPUs. A local user can run a specially crafted application and perform a denial of service attack or read contentsof kernel memory.
Remediation
Install updates from vendor's website.