Resource management error in Xen - CVE-2020-25598
Published: September 23, 2020
Vulnerability identifier: #VU46969
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/U:Green
CVE-ID: CVE-2020-25598
CWE-ID: CWE-399
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Xen
Xen
Software vendor:
Xen Project
Xen Project
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to missing unlock in XENMEM_acquire_resource error path in Xen. A malicious HVM stubdomain can cause an RCU reference to be leaked. This causes subsequent administration operations, (e.g. CPU offline) to livelock, resulting in a host denial of service.
The vulnerability only affects VMs using HVM stubdomains.
Remediation
Install updates from vendor's website.