xen: x86 PVH guest without LAPIC may DoS the host (XSA-256)
Published Feb 27, 2018
6.5
MEDIUMCVSS 3.0
EPSS 0.38%
Description
An issue was discovered in Xen 4.8.x through 4.10.x allowing x86 PVH guest OS users to cause a denial of service (NULL pointer dereference and hypervisor crash) by leveraging the mishandling of configurations that lack a Local APIC.
Affected products
No data.
Configuration 2
- 9.0
No data.
Red Hat Enterprise Linux 5
xen
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | xen | Not affected | n/a |
No package ranges for this CVE.
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:N/I:N/A:H
AV:L/AC:L/Au:N/C:N/I:N/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
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.38% (0.00382) | 29.77th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.40% (0.00396) | 31.11th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.06% (0.00055) | 14.52th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00059) | 26.93th | v3 (v2023.03.01) |
| May 25, 2024 | 0.06% (0.00059) | 24.81th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.06% (0.00059) | 22.80th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00950) | 32.28th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.95% (0.00950) | 13.46th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.29% (0.01294) | 30.79th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.29% (0.01294) | 0.00th | v1 |
References (9)
- http://www.securitytracker.com/id/1040776 vdb-entryx_refsource_SECTRACK
- http://xenbits.xen.org/xsa/advisory-256.html
- https://access.redhat.com/security/cve/CVE-2018-7542 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1544453 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2018-7542
- https://security.gentoo.org/glsa/201810-06 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2018-7542
- https://www.debian.org/security/2018/dsa-4131 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://xenbits.xen.org/xsa/advisory-256.html x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securitytracker.com/id/1040776 | vdb-entryx_refsource_SECTRACK | |
| http://xenbits.xen.org/xsa/advisory-256.html | ||
| https://access.redhat.com/security/cve/CVE-2018-7542 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1544453 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-7542 | ||
| https://security.gentoo.org/glsa/201810-06 | vendor-advisoryx_refsource_GENTOO | |
| https://www.cve.org/CVERecord?id=CVE-2018-7542 | ||
| https://www.debian.org/security/2018/dsa-4131 | vendor-advisoryx_refsource_DEBIANThird Party Advisory | |
| https://xenbits.xen.org/xsa/advisory-256.html | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.