SB2021102813 - Privilege escalation in Linux kernel PTRACE_TRACEME
Published: October 28, 2021 Updated: November 22, 2023
Security Bulletin ID
SB2021102813
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2021-43057)
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.
References
- 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/