Vulnerability identifier: #VU10780

Vulnerability risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-7540

CWE-ID: CWE-400

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description
The vulnerability allows an adjacent authenticated attacker to cause a DoS condition on the target system.

The weakness exists due to non-preemptable L3/L4 pagetable freeing. An adjacent attacker can exhaust all available CPU resources and cause the service to crash.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.10.0

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External links
http://xenbits.xen.org/xsa/advisory-252.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.