#VU12546 NULL pointer dereference in Xen - CVE-2018-7542

Vulnerability identifier: #VU12546

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-7542

CWE-ID: CWE-476

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

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

The weakness exists due to NULL pointer dereference. An adjacent attacker can cause the service to crash by leveraging the mishandling of configurations that lack a Local APIC.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.8.0 - 4.10.0

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External links
https://xenbits.xen.org/xsa/advisory-256.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.