Division by zero in Linux kernel - CVE-2023-54242
Published: December 30, 2025 / Updated: December 30, 2025
Vulnerability identifier: #VU120841
CSH Severity: Low
CVSS v4.0: 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-2023-54242
CWE-ID: CWE-369
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a division by zero error within the bfqq_request_over_limit() function in block/bfq-iosched.c. A local user can perform a denial of service (DoS) attack.
How to mitigate CVE-2023-54242
Install update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/1655cfc85250a224b0d9486c8136baeea33b9b5c
- https://git.kernel.org/stable/c/c0346a59d719461248c6dc6f21c9e55ef836b66f
- https://git.kernel.org/stable/c/e53413f8deedf738a6782cc14cc00bd5852ccf18
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.30
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.4
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.4