CVE-2018-19966 — xen: Conflicts with shadow paging due to XSA-240 incomplete fix (XSA-280)

Back Back to CVE browser

HIGH

xen: Conflicts with shadow paging due to XSA-240 incomplete fix (XSA-280)

Published Dec 8, 2018

8.8

HIGH

CVSS 3.0

EPSS 0.44%

Description

An issue was discovered in Xen through 4.11.x allowing x86 PV guest OS users to cause a denial of service (host OS crash) or possibly gain host OS privileges because of an interpretation conflict for a union data structure associated with shadow paging. NOTE: this issue exists because of an incorrect fix for CVE-2017-15595.

Affected products

Product	Package	State	Advisory
Red Hat Enterprise Linux 5	xen	Will not fix	n/a

Remediation

No remediation recorded yet.

Metrics

0.44% 0.00438

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.00438

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (15 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 2, 2026	0.44% (0.00438)	35.85th	v5 (v2026.06.15)
Jun 15, 2026	0.44% (0.00438)	34.73th	v5 (v2026.06.15)
Mar 17, 2025	0.07% (0.00071)	19.21th	v4 (v2025.03.14)
Dec 12, 2024	0.06% (0.00062)	28.60th	v3 (v2023.03.01)
Jun 26, 2024	0.06% (0.00062)	26.85th	v3 (v2023.03.01)
Dec 1, 2023	0.06% (0.00062)	24.84th	v3 (v2023.03.01)
Mar 7, 2023	0.04% (0.00045)	12.06th	v3 (v2023.03.01)
Mar 6, 2023	1.03% (0.01034)	41.69th	v2 (v2022.01.01)
Sep 10, 2022	1.03% (0.01034)	39.91th	v2 (v2022.01.01)
Apr 1, 2022	1.03% (0.01034)	37.91th	v2 (v2022.01.01)
Feb 4, 2022	1.03% (0.01034)	20.32th	v2 (v2022.01.01)
Feb 3, 2022	1.81% (0.01806)	35.10th	v1
Jan 6, 2022	1.81% (0.01806)	34.40th	v1
Sep 1, 2021	1.81% (0.01806)	74.37th	v1
Apr 14, 2021	1.81% (0.01806)	0.00th	v1

Weaknesses (2)

CWE-436

CWE-770

Allocation of Resources Without Limits

References (10)

http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00072.html
vendor-advisoryx_refsource_SUSE
http://www.securityfocus.com/bid/106182
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://access.redhat.com/security/cve/CVE-2018-19966
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1652235
Issue Tracking
https://lists.debian.org/debian-lts-announce/2019/10/msg00008.html
mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UXC6BME7SXJI2ZIATNXCAH7RGPI4UKTT/
vendor-advisoryx_refsource_FEDORA
https://nvd.nist.gov/vuln/detail/CVE-2018-19966
https://www.cve.org/CVERecord?id=CVE-2018-19966
https://www.debian.org/security/2019/dsa-4369
vendor-advisoryx_refsource_DEBIANThird Party Advisory
https://xenbits.xen.org/xsa/advisory-280.html
x_refsource_MISCMitigationPatchVendor Advisory

Link	Providers	Tags
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00072.html		vendor-advisoryx_refsource_SUSE
http://www.securityfocus.com/bid/106182		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://access.redhat.com/security/cve/CVE-2018-19966		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1652235		Issue Tracking
https://lists.debian.org/debian-lts-announce/2019/10/msg00008.html		mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UXC6BME7SXJI2ZIATNXCAH7RGPI4UKTT/		vendor-advisoryx_refsource_FEDORA
https://nvd.nist.gov/vuln/detail/CVE-2018-19966
https://www.cve.org/CVERecord?id=CVE-2018-19966
https://www.debian.org/security/2019/dsa-4369		vendor-advisoryx_refsource_DEBIANThird Party Advisory
https://xenbits.xen.org/xsa/advisory-280.html		x_refsource_MISCMitigationPatchVendor Advisory