QEMU: i386: multiboot OOB access while loading kernel image
Published Mar 1, 2018
8.8
HIGHCVSS 3.1
EPSS 0.61%
Description
The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS users to execute arbitrary code on the QEMU host via a mh_load_end_addr value greater than mh_bss_end_addr, which triggers an out-of-bounds read or write memory access.
Affected products
No data.
Configuration 2
- 7.0
- 8.0
- 9.0
Configuration 3
- 14.04
- 16.04
- 17.10
- 18.04
Configuration 4
- 7.0
- 7.0
- 7.6
- 7.7
- 7.5
- 7.6
- 7.7
- 7.6
- 7.7
- 7.0
No data.
Red Hat Enterprise Linux 7
qemu-kvm-10:1.5.3-156.el7_5.5
Fixed · RHSA-2018:2462
Red Hat OpenStack Platform 10.0 (Newton)
qemu-kvm-rhev-10:2.10.0-21.el7_5.3
Fixed · RHSA-2018:1644
Red Hat OpenStack Platform 12.0 (Pike)
qemu-kvm-rhev-10:2.10.0-21.el7_5.3
Fixed · RHSA-2018:1643
Red Hat OpenStack Platform 8.0 (Liberty)
qemu-kvm-rhev-10:2.10.0-21.el7_5.3
Fixed · RHSA-2018:1646
Red Hat OpenStack Platform 9.0 (Mitaka)
qemu-kvm-rhev-10:2.10.0-21.el7_5.3
Fixed · RHSA-2018:1645
Red Hat Virtualization 4 for Red Hat Enterprise Linux 7
qemu-kvm-rhev-10:2.10.0-21.el7_5.2
Fixed · RHSA-2018:1369
Red Hat Enterprise Linux 5
kvm
Not affected
Red Hat Enterprise Linux 5
xen
Not affected
Red Hat Enterprise Linux 6
qemu-kvm
Not affected
Red Hat Enterprise Linux 7
qemu-kvm-ma
Not affected
Red Hat Enterprise Linux 8
qemu-kvm
Not affected
Red Hat Enterprise Linux OpenStack Platform 7 (Kilo)
qemu-kvm-rhev
Will not fix
Red Hat OpenStack Platform 11 (Ocata)
qemu-kvm-rhev
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | qemu-kvm-10:1.5.3-156.el7_5.5 | Fixed | RHSA-2018:2462 |
| Red Hat OpenStack Platform 10.0 (Newton) | qemu-kvm-rhev-10:2.10.0-21.el7_5.3 | Fixed | RHSA-2018:1644 |
| Red Hat OpenStack Platform 12.0 (Pike) | qemu-kvm-rhev-10:2.10.0-21.el7_5.3 | Fixed | RHSA-2018:1643 |
| Red Hat OpenStack Platform 8.0 (Liberty) | qemu-kvm-rhev-10:2.10.0-21.el7_5.3 | Fixed | RHSA-2018:1646 |
| Red Hat OpenStack Platform 9.0 (Mitaka) | qemu-kvm-rhev-10:2.10.0-21.el7_5.3 | Fixed | RHSA-2018:1645 |
| Red Hat Virtualization 4 for Red Hat Enterprise Linux 7 | qemu-kvm-rhev-10:2.10.0-21.el7_5.2 | Fixed | RHSA-2018:1369 |
| 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 | Not affected | n/a |
| Red Hat Enterprise Linux 7 | qemu-kvm-ma | Not affected | n/a |
| Red Hat Enterprise Linux 8 | qemu-kvm | Not affected | n/a |
| Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) | qemu-kvm-rhev | Will not fix | n/a |
| Red Hat OpenStack Platform 11 (Ocata) | qemu-kvm-rhev | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
AV:L/AC:L/Au:N/C:P/I:P/A:P
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 (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.61% (0.00610) | 47.30th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.64% (0.00637) | 45.57th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.14% (0.00143) | 31.91th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.07% (0.00075) | 34.46th | v3 (v2023.03.01) |
| Jun 14, 2024 | 0.07% (0.00075) | 32.45th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.07% (0.00075) | 30.43th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.92% (0.01916) | 77.44th | v2 (v2022.01.01) |
| Nov 26, 2022 | 1.92% (0.01916) | 76.83th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.86% (0.01864) | 75.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.86% (0.01864) | 54.47th | v2 (v2022.01.01) |
| Feb 3, 2022 | 3.94% (0.03937) | 72.91th | v1 |
| Jan 6, 2022 | 3.94% (0.03937) | 72.67th | v1 |
| Sep 1, 2021 | 3.94% (0.03937) | 83.13th | v1 |
| Apr 14, 2021 | 3.94% (0.03937) | 0.00th | v1 |
References (14)
- http://www.securityfocus.com/bid/103181 vdb-entryThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2018:1369 vendor-advisoryThird Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2462 vendor-advisoryThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2018-7550 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1549798 Issue TrackingVendor Advisory
- https://github.com/orangecertcc/security-research/security/advisories/GHSA-f49v-45qp-cv53
- https://lists.debian.org/debian-lts-announce/2018/04/msg00015.html mailing-listMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/04/msg00016.html mailing-listMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html mailing-listMailing ListThird Party Advisory
- https://lists.gnu.org/archive/html/qemu-devel/2018-02/msg06890.html mailing-listMailing ListPatch
- https://nvd.nist.gov/vuln/detail/CVE-2018-7550
- https://usn.ubuntu.com/3649-1/ vendor-advisoryThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-7550
- https://www.debian.org/security/2018/dsa-4213 vendor-advisoryThird Party Advisory
Change history (0)
No recorded changes yet.