Use-after-free in Linux kernel - CVE-2026-46036
Published: May 28, 2026
Vulnerability identifier: #VU132459
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-2026-46036
CWE-ID: CWE-416
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 a use-after-free in vfio_cdx_set_msi_trigger() and the cdx_irqs array when handling concurrent VFIO_DEVICE_SET_IRQS ioctls. A local user can issue concurrent ioctl calls to trigger a use-after-free and cause a denial of service.
The issue occurs because one caller can observe config_msi as set while another caller clears it and frees the associated IRQ array.
How to mitigate CVE-2026-46036
Install security update from vendor's repository.