SB20240608211 - Improper locking in Linux kernel mptcp
Published: June 8, 2024 Updated: May 13, 2025
Security Bulletin ID
SB20240608211
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper locking (CVE-ID: CVE-2021-47242)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the subflow_error_report(), mptcp_space() and subflow_state_change() functions in net/mptcp/subflow.c, within the move_skbs_to_msk() and __mptcp_move_skbs() functions in net/mptcp/protocol.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.