Double free in Xen - CVE-2026-31787
Published: April 28, 2026
Vulnerability identifier: #VU128375
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31787
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Xen Project
Affected software:
Xen
Xen
Detailed vulnerability description
The vulnerability allows a local privileged user to circumvent kernel lockdown restrictions.
The vulnerability exists due to double free in the Linux kernel privcmd driver when handling privcmd operations. A local privileged user can trigger a double free of kernel memory to circumvent kernel lockdown restrictions.
Only Linux PVH or HVM domains booted in secure mode are affected; PV domains and non-Linux domains are not vulnerable.
How to mitigate CVE-2026-31787
Install security update from vendor's website.