Resource management error in Linux kernel - CVE-2021-46942
Published: June 24, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU93212
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2021-46942
CWE-ID: CWE-399
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to resource management error within the io_uring_del_task_file(), io_sq_thread(), tctx_inflight(), io_sqpoll_cancel_sync(), __io_uring_files_cancel() and io_uring_cancel_sqpoll() functions in fs/io_uring.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
How to mitigate CVE-2021-46942
Install update from vendor's website.
Linux kernel - addressed in versions 5.12.3, 5.13