Kernel: KVM: nVMX: guest accesses L0 MSR causes potential DoS
Published Apr 9, 2019
5.6
MEDIUMCVSS 3.1
EPSS 0.36%
Description
A flaw was found in the way KVM hypervisor handled x2APIC Machine Specific Rregister (MSR) access with nested(=1) virtualization enabled. In that, L1 guest could access L0's APIC register values via L2 guest, when 'virtualize x2APIC mode' is enabled. A guest could use this flaw to potentially crash the host kernel resulting in DoS issue. Kernel versions from 4.16 and newer are vulnerable to this issue.
Affected products
-
- Version from 4.16StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| The Linux Foundation | Kernel | n/a |
|
Configuration 1
- ≥ 4.16
Configuration 2
- 29
Configuration 3
- 18.04
- 18.10
- 19.04
Configuration 4
- 8.0
- 8.1
- 8.2
- 8.4
- 8
- 8
- 8.2
- 8.4
- 8.2
- 8.4
- 8.2
- 8.4
- 8.2
- 8.4
No data.
Red Hat Enterprise Linux 8
kernel-0:4.18.0-80.11.1.el8_0
Fixed · RHSA-2019:2703
Red Hat Enterprise Linux 8
kernel-rt-0:4.18.0-80.11.1.rt9.156.el8_0
Fixed · RHSA-2019:2741
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-alt
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise MRG 2
kernel-rt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 8 | kernel-0:4.18.0-80.11.1.el8_0 | Fixed | RHSA-2019:2703 |
| Red Hat Enterprise Linux 8 | kernel-rt-0:4.18.0-80.11.1.rt9.156.el8_0 | Fixed | RHSA-2019:2741 |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-alt | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise MRG 2 | kernel-rt | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the version of the kernel package as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:H
AV:L/AC:M/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 v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.36% (0.00358) | 27.20th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.36% (0.00355) | 27.18th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.02% (0.00018) | 2.63th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.05% (0.00052) | 22.38th | v3 (v2023.03.01) |
| Jun 20, 2024 | 0.05% (0.00052) | 20.69th | v3 (v2023.03.01) |
| Apr 2, 2024 | 0.05% (0.00052) | 18.67th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00045) | 12.26th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.10% (0.01104) | 54.09th | v2 (v2022.01.01) |
| Feb 13, 2023 | 1.10% (0.01104) | 53.53th | v2 (v2022.01.01) |
| Feb 3, 2023 | 1.28% (0.01282) | 67.60th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.10% (0.01104) | 52.45th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.10% (0.01104) | 50.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.41% (0.04411) | 70.76th | v2 (v2022.01.01) |
| Feb 3, 2022 | 7.85% (0.07855) | 85.01th | v1 |
| Jan 6, 2022 | 7.85% (0.07855) | 84.84th | v1 |
| Sep 1, 2021 | 1.86% (0.01865) | 76.13th | v1 |
| Apr 14, 2021 | 1.86% (0.01865) | 0.00th | v1 |
References (12)
- http://www.securityfocus.com/bid/107850 vdb-entryThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2019:2703 vendor-advisoryThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2741 vendor-advisoryThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2019-3887 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1695044 Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3887 Issue TrackingPatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IWPOIII2L73HV5PGXSGMRMKQIK47UIYE/ vendor-advisory
- https://nvd.nist.gov/vuln/detail/CVE-2019-3887
- https://usn.ubuntu.com/3979-1/ vendor-advisoryThird Party Advisory
- https://usn.ubuntu.com/3980-1/ vendor-advisoryThird Party Advisory
- https://usn.ubuntu.com/3980-2/ vendor-advisoryThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2019-3887
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/107850 | vdb-entryThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/errata/RHSA-2019:2703 | vendor-advisoryThird Party Advisory | |
| https://access.redhat.com/errata/RHSA-2019:2741 | vendor-advisoryThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2019-3887 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1695044 | Issue Tracking | |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3887 | Issue TrackingPatchThird Party Advisory | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IWPOIII2L73HV5PGXSGMRMKQIK47UIYE/ | vendor-advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2019-3887 | ||
| https://usn.ubuntu.com/3979-1/ | vendor-advisoryThird Party Advisory | |
| https://usn.ubuntu.com/3980-1/ | vendor-advisoryThird Party Advisory | |
| https://usn.ubuntu.com/3980-2/ | vendor-advisoryThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2019-3887 |
Change history (0)
No recorded changes yet.