Skip to content
Fencer Intel
medium 4.9

CVE-2015-4164 json

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…

published 2015-06-15 11 y ago modified 2026-06-17 4 mo ago also EUVD-2015-4188

cvss
4.9
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

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.

Patch / fix

  • xen Debian 14, Debian 13, Debian 12 4.6.0-1

debian advisories DEBIAN-CVE-2015-4164

  • xen Ubuntu 14.04 LTS 4.4.2-0ubuntu0.14.04.2

ubuntu advisories UBUNTU-CVE-2015-4164

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • xen SLES 11 SP3-TERADATA, SLES 11 SP3, SLED 11 SP3 +2 more 4.2.5_12-15.1
  • xen SLES for SAP 12, SLES 12, SLED 12 +1 more 4.4.2_06-21.1

suse advisories SUSE-SU-2015:1479-2SUSE-SU-2015:1479-1SUSE-SU-2015:1042-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-4164 updated cvss 4.3

xen: iret hypercall handler vulnerability (xsa-136)

  • Red Hat Enterprise Linux 5 xen
    affected: no fix available

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.9 AV:L/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-399 Resource Management Errors

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.