CVE-2023-54242
kernel: block, bfq: Fix division by zero error on zero wsum
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · December 30, 2025
Updated · June 30, 2026
Description
A division by zero error was found in the BFQ I/O scheduler. When the weighted sum of I/O priorities becomes zero, the limit calculation divides by zero, causing a kernel crash.
Statement
Triggering this requires root privileges to manipulate I/O priorities in specific ways using tools like stress-ng. Standard workloads do not create zero-weighted-sum conditions in the BFQ scheduler.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-369 · Divide By Zero