kernel: x86: espfix not working for 32-bit KVM paravirt guests
Published Dec 12, 2014
3.3
LOWCVSS 3.1
EPSS 0.70%
Description
The paravirt_ops_setup function in arch/x86/kernel/kvm.c in the Linux kernel through 3.18 uses an improper paravirt_enabled setting for KVM guest kernels, which makes it easier for guest OS users to bypass the ASLR protection mechanism via a crafted application that reads a 16-bit value.
Affected products
No data.
Configuration 1
- ≤ 3.18
Configuration 2
- 12.04
- 14.04
- 16.04
Configuration 3
No data.
Red Hat Enterprise Linux 6
kernel-0:2.6.32-642.el6
Fixed · RHSA-2016:0855
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise MRG 2
kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | kernel-0:2.6.32-642.el6 | Fixed | RHSA-2016:0855 |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise MRG 2 | kernel | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 7, and Red Hat Enterprise Linux MRG 2.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
No CVSS v3.0 score for this CVE.
AV:L/AC:M/Au:N/C:P/I:N/A:N
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 (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.70% (0.00703) | 51.53th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.70% (0.00703) | 48.23th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.09% (0.00089) | 23.22th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.16% (0.00157) | 53.43th | v3 (v2023.03.01) |
| Jul 3, 2024 | 0.16% (0.00157) | 52.35th | v3 (v2023.03.01) |
| Mar 14, 2023 | 0.16% (0.00157) | 50.34th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.15% (0.00146) | 48.68th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.69% (0.02686) | 82.85th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.69% (0.02686) | 81.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.69% (0.02686) | 62.66th | v2 (v2022.01.01) |
No CWE recorded.
References (18)
- http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00010.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00025.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00009.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00015.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://people.canonical.com/~ubuntu-security/cve/2014/CVE-2014-8134.html x_refsource_CONFIRMPatchThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-0855.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://secunia.com/advisories/62336 third-party-advisoryx_refsource_SECUNIABroken Link
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html x_refsource_CONFIRMThird Party Advisory
- http://www.securityfocus.com/bid/71650 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.spinics.net/lists/kvm/msg111458.html mailing-listx_refsource_MLISTExploitMailing ListPatchThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2014-8134 Vendor Advisory
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400314 x_refsource_CONFIRMVendor Advisory
- https://bugzilla.novell.com/show_bug.cgi?id=909078 x_refsource_CONFIRMPermissions Required
- https://bugzilla.redhat.com/show_bug.cgi?id=1172765 x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2014-8134
- https://support.f5.com/csp/article/K17120 x_refsource_CONFIRMThird Party Advisory
- https://support.f5.com/csp/article/K17120?utm_source=f5support&%3Butm_medium=RSS x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2014-8134
Change history (0)
No recorded changes yet.