Use-after-free in Linux kernel - CVE-2021-43057
Published: October 28, 2021 / Updated: March 1, 2023
Vulnerability identifier: #VU83427
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-2021-43057
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 authenticated user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME). A local authenticated user can trigger a use-after-free error and escalate privileges on the system.
Remediation
Install update from vendor's website.
External links
- https://bugs.chromium.org/p/project-zero/issues/detail?id=2229
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.8
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a3727a8bac0a9e77c70820655fd8715523ba3db7
- https://security.netapp.com/advisory/ntap-20211125-0001/