Improper privilege management in Xen - #VU140013
Published: July 29, 2026
Vulnerability identifier: #VU140013
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-269
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to escalate privileges.
The vulnerability exists due to improper isolation in pygrub when processing guest-controlled boot and file system data. A remote user can supply a crafted guest boot environment to escalate privileges.
Successful exploitation can give control equivalent to the domain construction tools, typically resulting in control of the host.
Affected software
Xen
Remediation
Install security update from vendor's website.