Improper locking in Linux kernel - CVE-2026-43392
Published: May 8, 2026
Vulnerability identifier: #VU130793
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-2026-43392
CWE-ID: CWE-667
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 cause a denial of service.
The vulnerability exists due to improper scheduling logic in scx_enable() when switching the calling thread from fair to ext class under fair-class saturation. A local user can trigger scx_enable() while the system is saturated with fair-class workloads to cause a denial of service.
The issue can indefinitely starve the enable thread and hang the system.
How to mitigate CVE-2026-43392
Install security update from vendor's repository.