CVE-2015-4164

Description

The compat_iret function in Xen 3.1 through 4.5 iterates the wrong way through a loop, which allows local 32-bit PV guest administrators to cause a denial of service (large loop and system hang) via a hypercall_iret call with EFLAGS.VM set.

Category

4.9
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 0.07%
Vendor Advisory debian.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory gentoo.org Vendor Advisory opensuse.org Vendor Advisory xen.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.securityfocus.com/bid/75149 vdb entry
http://www.debian.org/security/2015/dsa-3286 vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00029.html vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00027.html vendor advisory
http://www.securitytracker.com/id/1032569 vdb entry
http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00014.html vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00030.html vendor advisory
http://support.citrix.com/article/CTX201145
http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00007.html vendor advisory
http://xenbits.xen.org/xsa/advisory-136.html vendor advisory
https://security.gentoo.org/glsa/201604-03 vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2015-06/msg00004.html vendor advisory

Frequently Asked Questions

What is the severity of CVE-2015-4164?
CVE-2015-4164 has been scored as a medium severity vulnerability.
How to fix CVE-2015-4164?
To fix CVE-2015-4164, 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-2015-4164 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2015-4164 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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