Incorrect calculation in Linux kernel - CVE-2021-47124
Published: July 4, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU93782
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-2021-47124
CWE-ID: CWE-682
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 incorrect calculation within the io_link_timeout_fn() function in fs/io_uring.c. A local user can perform a denial of service (DoS) attack.
Affected software
Linux kernel
How to mitigate CVE-2021-47124
Install update from vendor's website.
Linux kernel - addressed in versions 5.10.43, 5.10.55, 5.12.10, 5.12.19, 5.13
External References
- https://git.kernel.org/stable/c/0b2a990e5d2f76d020cb840c456e6ec5f0c27530
- https://git.kernel.org/stable/c/6f5d7a45f58d3abe3a936de1441b8d6318f978ff
- https://git.kernel.org/stable/c/876808dba2ff7509bdd7f230c4f374a0caf4f410
- https://git.kernel.org/stable/c/ff4a96ba5c8f9b266706280ff8021d2ef3f17e86
- https://git.kernel.org/stable/c/a298232ee6b9a1d5d732aa497ff8be0d45b5bd82
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.43
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.55
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.10
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.19
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13