CVE-2018-7540

Description

An issue was discovered in Xen through 4.10.x allowing x86 PV guest OS users to cause a denial of service (host OS CPU hang) via non-preemptable L3/L4 pagetable freeing.

Category

6.5
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.09%
Vendor Advisory gentoo.org Vendor Advisory debian.org Vendor Advisory xen.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://xenbits.xen.org/xsa/advisory-252.html vendor advisory
https://security.gentoo.org/glsa/201810-06 vendor advisory
http://www.securitytracker.com/id/1040773 vdb entry
https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html mailing list
https://lists.debian.org/debian-lts-announce/2018/03/msg00003.html third party advisory mailing list
http://www.securityfocus.com/bid/103174 vdb entry
https://www.debian.org/security/2018/dsa-4131 third party advisory vendor advisory
https://support.citrix.com/article/CTX232655
https://support.citrix.com/article/CTX232096

Frequently Asked Questions

What is the severity of CVE-2018-7540?
CVE-2018-7540 has been scored as a medium severity vulnerability.
How to fix CVE-2018-7540?
To fix CVE-2018-7540, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-7540 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2018-7540 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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