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CVE-2015-4164

17
FAUCET Score

CVE-2015-4164 describes a denial-of-service vulnerability in Xen versions 3.1 through 4.5. A local 32-bit PV guest administrator can trigger a system hang by exploiting a flaw in the compat_iret function, specifically by making a hypercall_iret call with EFLAGS.VM set, causing an infinite loop. This vulnerability has a CVSS score of 4.9, indicating a low attack complexity and local access requirement, with the primary impact being system availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.1.3CPE matchmatch criteria
cpe:2.3:o:xen:xen:3.1.3:*:*:*:*:*:*:*
3.1.4CPE matchmatch criteria
cpe:2.3:o:xen:xen:3.1.4:*:*:*:*:*:*:*
3.2.0CPE matchmatch criteria
cpe:2.3:o:xen:xen:3.2.0:*:*:*:*:*:*:*
3.2.1CPE matchmatch criteria
cpe:2.3:o:xen:xen:3.2.1:*:*:*:*:*:*:*
3.2.2CPE matchmatch criteria
cpe:2.3:o:xen:xen:3.2.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.9MEDIUM

AV:L/AC:L/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Exploitability Score
3.9
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
0.44%
Probability of exploitation in next 30 days
EPSS Percentile
35.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0044 is in the 66th percentile among its peer group of 3,052 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xen

Vendor Advisories (1)

redhatCVE-2015-4164Moderate

xen: iret hypercall handler vulnerability (xsa-136)

Jun 11, 2015

References

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