Use-after-free in Linux kernel - CVE-2026-46036

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU132459

Use-after-free in Linux kernel - CVE-2026-46036

Published: May 28, 2026


Vulnerability identifier: #VU132459
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-2026-46036
CWE-ID: CWE-416
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 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.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-raspi (Ubuntu package)

How to mitigate CVE-2026-46036

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-27.27
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-nvidia (Ubuntu package) - update to 7.0.0-1013.13
linux-raspi (Ubuntu package) - update to 7.0.0-1014.14

External References

Related Security Bulletins