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Fencer Intel
high 7.2

CVE-2015-2151 json

The x86 emulator in Xen 3.2.x through 4.5.x does not properly ignore segment overrides for instructions with register operands, which allow…

published 11y ago modified 4mo ago also EUVD-2015-2261

cvss
7.2
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 46%
public exploits
0
none known

Summary

The x86 emulator in Xen 3.2.x through 4.5.x does not properly ignore segment overrides for instructions with register operands, which allows local guest users to obtain sensitive information, cause a denial of service (memory corruption), or possibly execute arbitrary code via unspecified vectors.

Patch / fix

  • xen Debian 14, Debian 13, Debian 12 4.4.1-8

debian advisories DEBIAN-CVE-2015-2151

  • xen Ubuntu 14.04 LTS 4.4.1-0ubuntu0.14.04.4

ubuntu advisories UBUNTU-CVE-2015-2151

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

  • kernel RHEL 5 2.6.18-409.el5
  • kernel-PAE RHEL 5 2.6.18-409.el5
  • kernel-xen RHEL 5 2.6.18-409.el5
  • kernel-kdump RHEL 5 2.6.18-409.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-409.el5

red hat advisories RHSA-2016:0450

  • xen SLES for SAP 12, SLES 12, SLED 12 +1 more 4.4.1_10-9.1

suse advisories SUSE-SU-2015:0613-1

Is CVE-2015-2151 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2015-2151 updated cvss 6.5

xen: hypervisor memory corruption due to x86 emulator flaw (xsa123)

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-409.el5, kernel-PAE 2.6.18-409.el5, kernel-xen 2.6.18-409.el5, kernel-kdump 2.6.18-409.el5, kernel-debuginfo-common 2.6.18-409.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-409.el5, kernel-PAE 2.6.18-409.el5, kernel-xen 2.6.18-409.el5, kernel-kdump 2.6.18-409.el5, kernel-debuginfo-common 2.6.18-409.el5
    fixed: vendor fix RHSA-2016:0450

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

0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-264 Permissions, Privileges, and Access Controls

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.