kernel: kvm: x86: NULL pointer dereference during instruction decode
Published Nov 28, 2016
6.2
MEDIUMCVSS 3.0
EPSS 0.36%
Description
The x86_decode_insn function in arch/x86/kvm/emulate.c in the Linux kernel before 4.8.7, when KVM is enabled, allows local users to cause a denial of service (host OS crash) via a certain use of a ModR/M byte in an undefined instruction.
Affected products
No data.
- ≤ 4.8.6
No data.
Red Hat Enterprise Linux 7
kernel-0:3.10.0-514.10.2.el7
Fixed · RHSA-2017:0386
Red Hat Enterprise Linux 7
kernel-rt-0:3.10.0-514.10.2.rt56.435.el7
Fixed · RHSA-2017:0387
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise MRG 2
realtime-kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | kernel-0:3.10.0-514.10.2.el7 | Fixed | RHSA-2017:0386 |
| Red Hat Enterprise Linux 7 | kernel-rt-0:3.10.0-514.10.2.rt56.435.el7 | Fixed | RHSA-2017:0387 |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise MRG 2 | realtime-kernel | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2. This issue affects the version of Linux kernel as shipped with Red Hat Enterprise Linux 7. Future kernel updates for Red Hat Enterprise Linux 7 may address this issue.
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:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:A/AC:L/PR:H/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
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.36% (0.00364) | 27.88th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.36% (0.00364) | 28.05th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.06% (0.00058) | 15.41th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 5.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | 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 | 1.10% (0.01104) | 28.85th | v2 (v2022.01.01) |
References (11)
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d9092f52d7e61dd1557f2db2400ddb430e85937e x_refsource_CONFIRMIssue TrackingPatchVendor Advisory
- http://rhn.redhat.com/errata/RHSA-2017-0386.html vendor-advisoryx_refsource_REDHAT
- http://rhn.redhat.com/errata/RHSA-2017-0387.html vendor-advisoryx_refsource_REDHAT
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.7 x_refsource_CONFIRMRelease Notes
- http://www.openwall.com/lists/oss-security/2016/11/22/3 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/94459 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2016-8630 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1393350 x_refsource_CONFIRMIssue Tracking
- https://github.com/torvalds/linux/commit/d9092f52d7e61dd1557f2db2400ddb430e85937e x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2016-8630
- https://www.cve.org/CVERecord?id=CVE-2016-8630
Change history (0)
No recorded changes yet.