CVE-2015-4164

Severity: medium (CVSS 4.9 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2015-06-15 · updated 2026-06-17
Weakness: CWE-399

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.

Affected products

xen: 3.1.3, 3.1.4, 3.2.0, 3.2.1, 3.2.2, 3.2.3 (+31)

References

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

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