CVE-2017-10921

Description

The grant-table feature in Xen through 4.8.x does not ensure sufficient type counts for a GNTMAP_device_map and GNTMAP_host_map mapping, which allows guest OS users to cause a denial of service (count mismanagement and memory corruption) or obtain privileged host OS access, aka XSA-224 bug 2.

Category

10.0
CVSS
Severity: Critical
CVSS 3.0 •
CVSS 2.0 •
EPSS 1.13% Top 25%
Vendor Advisory gentoo.org Vendor Advisory debian.org Vendor Advisory gentoo.org Vendor Advisory xen.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://security.gentoo.org/glsa/201708-03 vendor advisory
http://www.debian.org/security/2017/dsa-3969 vendor advisory
http://www.securitytracker.com/id/1038734 vdb entry
https://xenbits.xen.org/xsa/advisory-224.html patch vendor advisory
https://security.gentoo.org/glsa/201710-17 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2017-10921?
CVE-2017-10921 has been scored as a critical severity vulnerability.
How to fix CVE-2017-10921?
To fix CVE-2017-10921, 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-2017-10921 being actively exploited in the wild?
It is possible that CVE-2017-10921 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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