xen: Nested VT-x usable even when disabled
Published Nov 1, 2018
8.8
HIGHCVSS 3.0
EPSS 0.44%
Description
An issue was discovered in Xen 4.9.x through 4.11.x, on Intel x86 platforms, allowing x86 HVM and PVH guests to cause a host OS denial of service (NULL pointer dereference) or possibly have unspecified other impact because nested VT-x is not properly restricted.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
AV:L/AC:L/Au:N/C:C/I:C/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.44% (0.00437) | 35.65th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.44% (0.00437) | 37.42th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.05% (0.00052) | 21.27th | v3 (v2023.03.01) |
| Jun 14, 2024 | 0.05% (0.00052) | 20.83th | v3 (v2023.03.01) |
| Oct 25, 2023 | 0.05% (0.00052) | 18.82th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00044) | 10.26th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00890) | 30.33th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00890) | 12.04th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.04% (0.01036) | 27.56th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.04% (0.01036) | 0.00th | v1 |
References (7)
- http://www.securityfocus.com/bid/105817 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1042021 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2018-18883 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1643116 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2018-18883
- https://www.cve.org/CVERecord?id=CVE-2018-18883
- https://xenbits.xen.org/xsa/advisory-278.html x_refsource_MISCMitigationPatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/105817 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1042021 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2018-18883 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1643116 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-18883 | ||
| https://www.cve.org/CVERecord?id=CVE-2018-18883 | ||
| https://xenbits.xen.org/xsa/advisory-278.html | x_refsource_MISCMitigationPatchVendor Advisory |
Change history (0)
No recorded changes yet.