Improper locking in Linux kernel - CVE-2021-47242

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Main Vulnerability Database Vulnerabilities #VU91512

Improper locking in Linux kernel - CVE-2021-47242

Published: June 8, 2024 / Updated: May 13, 2025


Vulnerability identifier: #VU91512
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-47242
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability: No public exploit available
Vulnerable software:
Linux kernel
Software vendor:
Linux Foundation

Description

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.

External links