Qemu: cirrus: heap buffer overflow via vnc connection
Published Jul 27, 2018
9.9
CRITICALCVSS 3.0
EPSS 4.45%
Description
A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA emulator's VNC display driver support before 2.9; the issue could occur when a VNC client attempted to update its display after a VGA operation is performed by a guest. A privileged user/process inside a guest could use this flaw to crash the QEMU process or, potentially, execute arbitrary code on the host with privileges of the QEMU process.
Affected products
-
- Version 2.9StatusaffectedConstraints-
- Version
Configuration 2
- 6.0.2
- 6.2.0
- 6.5
- 7.0
- 7.1
- 5.0
- 6.0
- 7.0
- 8
- 9
- 10
- 7.0
- 6.0
- 7.0
- 6.0
- 7.0
- 7.3
- 7.4
- 7.3
- 7.4
- 7.5
- 6.0
- 7.0
No data.
RHEV 3.X Hypervisor and Agents for RHEL-6
qemu-kvm-rhev-2:0.12.1.2-2.503.el6_9.3
Fixed · RHSA-2017:1205
RHEV 3.X Hypervisor and Agents for RHEL-7
qemu-kvm-rhev-10:2.6.0-28.el7_3.9
Fixed · RHSA-2017:0985
Red Hat Enterprise Linux 6
qemu-kvm-2:0.12.1.2-2.503.el6_9.3
Fixed · RHSA-2017:1206
Red Hat Enterprise Linux 7
qemu-kvm-10:1.5.3-126.el7_3.6
Fixed · RHSA-2017:0987
Red Hat Enterprise Linux OpenStack Platform 5.0 (Icehouse) for RHEL 6
qemu-kvm-rhev-2:0.12.1.2-2.503.el6_9.3
Fixed · RHSA-2017:1441
Red Hat Enterprise Linux OpenStack Platform 5.0 (Icehouse) for RHEL 7
qemu-kvm-rhev-10:2.6.0-28.el7_3.9
Fixed · RHSA-2017:0980
Red Hat Enterprise Linux OpenStack Platform 6.0 (Juno) for RHEL 7
qemu-kvm-rhev-10:2.6.0-28.el7_3.9
Fixed · RHSA-2017:0981
Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7
qemu-kvm-rhev-10:2.6.0-28.el7_3.9
Fixed · RHSA-2017:0982
Red Hat OpenStack Platform 10.0 (Newton)
qemu-kvm-rhev-10:2.6.0-28.el7_3.9
Fixed · RHSA-2017:0988
Red Hat OpenStack Platform 8.0 (Liberty)
qemu-kvm-rhev-10:2.6.0-28.el7_3.9
Fixed · RHSA-2017:0983
Red Hat OpenStack Platform 9.0 (Mitaka)
qemu-kvm-rhev-10:2.6.0-28.el7_3.9
Fixed · RHSA-2017:0984
Red Hat Virtualization 4 for Red Hat Enterprise Linux 7
qemu-kvm-rhev-10:2.6.0-28.el7_3.9
Fixed · RHSA-2017:0985
Red Hat Enterprise Linux 5
kvm
Not affected
Red Hat Enterprise Linux 5
xen
Not affected
Red Hat Enterprise Linux 6
qemu-kvm-rhev
Affected
Red Hat OpenStack Platform 11 (Ocata)
qemu-kvm-rhev
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| RHEV 3.X Hypervisor and Agents for RHEL-6 | qemu-kvm-rhev-2:0.12.1.2-2.503.el6_9.3 | Fixed | RHSA-2017:1205 |
| RHEV 3.X Hypervisor and Agents for RHEL-7 | qemu-kvm-rhev-10:2.6.0-28.el7_3.9 | Fixed | RHSA-2017:0985 |
| Red Hat Enterprise Linux 6 | qemu-kvm-2:0.12.1.2-2.503.el6_9.3 | Fixed | RHSA-2017:1206 |
| Red Hat Enterprise Linux 7 | qemu-kvm-10:1.5.3-126.el7_3.6 | Fixed | RHSA-2017:0987 |
| Red Hat Enterprise Linux OpenStack Platform 5.0 (Icehouse) for RHEL 6 | qemu-kvm-rhev-2:0.12.1.2-2.503.el6_9.3 | Fixed | RHSA-2017:1441 |
| Red Hat Enterprise Linux OpenStack Platform 5.0 (Icehouse) for RHEL 7 | qemu-kvm-rhev-10:2.6.0-28.el7_3.9 | Fixed | RHSA-2017:0980 |
| Red Hat Enterprise Linux OpenStack Platform 6.0 (Juno) for RHEL 7 | qemu-kvm-rhev-10:2.6.0-28.el7_3.9 | Fixed | RHSA-2017:0981 |
| Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7 | qemu-kvm-rhev-10:2.6.0-28.el7_3.9 | Fixed | RHSA-2017:0982 |
| Red Hat OpenStack Platform 10.0 (Newton) | qemu-kvm-rhev-10:2.6.0-28.el7_3.9 | Fixed | RHSA-2017:0988 |
| Red Hat OpenStack Platform 8.0 (Liberty) | qemu-kvm-rhev-10:2.6.0-28.el7_3.9 | Fixed | RHSA-2017:0983 |
| Red Hat OpenStack Platform 9.0 (Mitaka) | qemu-kvm-rhev-10:2.6.0-28.el7_3.9 | Fixed | RHSA-2017:0984 |
| Red Hat Virtualization 4 for Red Hat Enterprise Linux 7 | qemu-kvm-rhev-10:2.6.0-28.el7_3.9 | Fixed | RHSA-2017:0985 |
| Red Hat Enterprise Linux 5 | kvm | Not affected | n/a |
| Red Hat Enterprise Linux 5 | xen | Not affected | n/a |
| Red Hat Enterprise Linux 6 | qemu-kvm-rhev | Affected | n/a |
| Red Hat OpenStack Platform 11 (Ocata) | qemu-kvm-rhev | 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:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
AV:N/AC:L/Au:S/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
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.45% (0.04448) | 91.11th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.45% (0.04448) | 90.14th | v5 (v2026.06.15) |
| Feb 10, 2026 | 1.59% (0.01587) | 81.28th | v4 (v2025.03.14) |
| May 30, 2025 | 0.56% (0.00563) | 67.23th | v4 (v2025.03.14) |
| Mar 30, 2025 | 1.89% (0.01894) | 81.58th | v4 (v2025.03.14) |
| Mar 29, 2025 | 4.37% (0.04368) | 81.25th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.89% (0.01894) | 82.00th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.14% (0.00135) | 50.54th | v3 (v2023.03.01) |
| Feb 20, 2024 | 0.14% (0.00140) | 48.41th | v3 (v2023.03.01) |
| Jul 21, 2023 | 0.17% (0.00174) | 53.64th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.13% (0.00128) | 45.73th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.99% (0.02993) | 83.57th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.99% (0.02993) | 81.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.99% (0.02993) | 64.39th | v2 (v2022.01.01) |
References (22)
- http://www.securityfocus.com/bid/96893 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1038023 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:0980 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0981 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0982 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0983 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0984 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0985 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0987 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:0988 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:1205 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:1206 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:1441 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2016-9603 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1430056 Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-9603 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/02/msg00005.html mailing-listx_refsource_MLISTThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2016-9603
- https://security.gentoo.org/glsa/201706-03 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://support.citrix.com/article/CTX221578 x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2016-9603
Change history (0)
No recorded changes yet.