Improper Initialization in Linux kernel - CVE-2026-43087
Published: May 7, 2026
Vulnerability identifier: #VU130680
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-2026-43087
CWE-ID: CWE-665
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper initialization in the mcp23s08 interrupt handling during device probe when probing a chip with interrupt-on-change enabled on some pins. A local user can trigger device initialization in this state to cause a denial of service.
The issue occurs because interrupts may be generated for pins that do not yet have a registered nested handler, leading to a kernel crash.
Affected software
Linux kernel
How to mitigate CVE-2026-43087
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3