Xen in the Linux kernel, when running a guest on a host without hardware assisted paging (HAP), allows guest users to cause a denial of ser…

published 2013-12-27 12 y ago modified 2026-06-16 4 mo ago also EUVD-2011-2504

cvss: 5.5; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits: 0; none known

Xen in the Linux kernel, when running a guest on a host without hardware assisted paging (HAP), allows guest users to cause a denial of service (invalid pointer dereference and hypervisor crash) via the SAHF instruction.

Patch / fix

fixed in 1 distros 1 links 1

xen xen 3.3.0

kernel RHEL 5 2.6.18-274.3.1.el5
kernel-PAE RHEL 5 2.6.18-274.3.1.el5
kernel-xen RHEL 5 2.6.18-274.3.1.el5
kernel-kdump RHEL 5 2.6.18-274.3.1.el5
kernel-debuginfo-common RHEL 5 2.6.18-274.3.1.el5
kernel RHEL 5.6 EUS 2.6.18-238.31.1.el5
kernel-PAE RHEL 5.6 EUS 2.6.18-238.31.1.el5
kernel-xen RHEL 5.6 EUS 2.6.18-238.31.1.el5

red hat advisories RHSA-2011:1813 RHSA-2011:1212

xenbits.xen.org/hg/xen-3.1-testing.hg/rev/15644 advisory

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-2011-2519 updated 2026-11-05 cvss 5.2

kernel: xen: x86_emulate: fix SAHF emulation

Red Hat Enterprise Linux 5 kernel
affected: no fix available
Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-274.3.1.el5, kernel-PAE 2.6.18-274.3.1.el5, kernel-xen 2.6.18-274.3.1.el5, kernel-kdump 2.6.18-274.3.1.el5, kernel-debuginfo-common 2.6.18-274.3.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-274.3.1.el5, kernel-PAE 2.6.18-274.3.1.el5, kernel-xen 2.6.18-274.3.1.el5, kernel-debuginfo-common 2.6.18-274.3.1.el5
fixed: vendor fix RHSA-2011:1212
Red Hat Enterprise Linux EUS (v. 5.6 server) kernel 2.6.18-238.31.1.el5, kernel-PAE 2.6.18-238.31.1.el5, kernel-xen 2.6.18-238.31.1.el5, kernel-kdump 2.6.18-238.31.1.el5, kernel-debuginfo-common 2.6.18-238.31.1.el5
fixed: vendor fix RHSA-2011:1813
Red Hat Enterprise Linux 4 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
not affected: vulnerable code not present

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

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	2.0	5.5	AV:A/AC:L/Au:S/C:N/I:N/A:C

Classification

Weakness

CWE-476 NULL Pointer Dereference

References

xenbits.xen.org /hg/xen-3.1-testing.hg/rev/15644
patch, vendor-advisory
rhn.redhat.com /errata/RHSA-2011-1212.html
vendor-advisory, third-party-advisory
openwall.com /lists/oss-security/2011/08/30/1
mailing-list, third-party-advisory
bugzilla.redhat.com /show_bug.cgi?id=718882
issue-tracking, third-party-advisory

Sources

CVE List CVE-2011-2519
NVD CVE-2011-2519

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.

Summary