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Fencer Intel
low 1.9

CVE-2013-4368 json

The outs instruction emulation in Xen 3.1.x, 4.2.x, 4.3.x, and earlier, when using FS: or GS: segment override, uses an uninitialized varia…

published 2013-10-17 13 y ago modified 2026-06-16 4 mo ago also EUVD-2013-4250

cvss
1.9
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 30%
public exploits
0
none known

Summary

The outs instruction emulation in Xen 3.1.x, 4.2.x, 4.3.x, and earlier, when using FS: or GS: segment override, uses an uninitialized variable as a segment base, which allows local 64-bit PV guests to obtain sensitive information (hypervisor stack content) via unspecified vectors related to stale data in a segment register.

Patch / fix

  • xen Debian 14, Debian 13, Debian 12 4.4.0-1

debian advisories DEBIAN-CVE-2013-4368

  • kernel RHEL 5 2.6.18-371.1.2.el5
  • kernel-PAE RHEL 5 2.6.18-371.1.2.el5
  • kernel-xen RHEL 5 2.6.18-371.1.2.el5
  • kernel-kdump RHEL 5 2.6.18-371.1.2.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-371.1.2.el5

red hat advisories RHSA-2013:1449

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-2013-4368 updated cvss 2.3

xen: information leak through outs instruction emulation (XSA-67)

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-371.1.2.el5, kernel-PAE 2.6.18-371.1.2.el5, kernel-xen 2.6.18-371.1.2.el5, kernel-kdump 2.6.18-371.1.2.el5, kernel-debuginfo-common 2.6.18-371.1.2.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-371.1.2.el5, kernel-PAE 2.6.18-371.1.2.el5, kernel-xen 2.6.18-371.1.2.el5, kernel-kdump 2.6.18-371.1.2.el5, kernel-debuginfo-common 2.6.18-371.1.2.el5
    fixed: vendor fix RHSA-2013:1449

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

0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 1.9 AV:L/AC:M/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

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.