Vulnerability identifier: #VU46969
Vulnerability risk: Medium
CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-399
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Xen
Server applications /
Virtualization software
Vendor: 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.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Xen: 4.12.0 - 4.14.0
External links
http://xenbits.xen.org/xsa/advisory-334.html
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.