SB2022012123 - Privilege escalation in Linux kernel ebpf
Published: January 21, 2022 Updated: October 5, 2023
Security Bulletin ID
SB2022012123
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Race condition (CVE-ID: CVE-2021-4001)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition in kernel/bpf/syscall.c in Linux kernel ebpf. A local user can exploit the race between bpf_map_update_elem and bpf_map_freeze and modify the frozen mapped address space.
Remediation
Install update from vendor's website.