xen: resource accounting issues in x86 IOREQ server handling (XSA-276)
Published Dec 8, 2018
7.8
HIGHCVSS 3.0
EPSS 0.36%
Description
An issue was discovered in Xen 4.11 allowing HVM guest OS users to cause a denial of service (host OS crash) or possibly gain host OS privileges because x86 IOREQ server resource accounting (for external emulators) was mishandled.
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:H/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:N/UI:N/S:U/C:N/I:N/A:H
AV:L/AC:M/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 (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.36% (0.00364) | 27.85th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.36% (0.00364) | 30.22th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.04% (0.00044) | 12.95th | v3 (v2023.03.01) |
| May 25, 2024 | 0.04% (0.00044) | 12.27th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00044) | 10.26th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.78% (0.00777) | 21.50th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.78% (0.00777) | 0.00th | v1 |
References (6)
- http://www.securityfocus.com/bid/106182 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2018-19963 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1652231 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2018-19963
- https://www.cve.org/CVERecord?id=CVE-2018-19963
- https://xenbits.xen.org/xsa/advisory-276.html x_refsource_MISCPatchThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/106182 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2018-19963 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1652231 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-19963 | ||
| https://www.cve.org/CVERecord?id=CVE-2018-19963 | ||
| https://xenbits.xen.org/xsa/advisory-276.html | x_refsource_MISCPatchThird Party Advisory |
Change history (0)
No recorded changes yet.