CVE-2018-7550

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

March 1, 2018

Last Modified

November 21, 2024

Advisory Details (9)

Auto-updated Aug 16, 2026
🔬 Proof of concept available. Patch available. Sources: redhat, github.
generic

[Qemu-devel] [PATCH] multiboot: check mh_load_end_addr address field

https://lists.gnu.org/archive/html/qemu-devel/2018-02/msg06890.html
generic Patch Available

[SECURITY] [DLA 1497-1] qemu security update

https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html
generic Patch Available

[SECURITY] [DLA 1351-1] qemu security update

https://lists.debian.org/debian-lts-announce/2018/04/msg00016.html
generic Patch Available

[SECURITY] [DLA 1350-1] qemu-kvm security update

https://lists.debian.org/debian-lts-announce/2018/04/msg00015.html
github Patch Available🟡 PoC Available

QEMU - Out of bound memory access on multiboot kernel load (CVE-2018-7550) · Advisory · orangecertcc/security-research · GitHub

https://github.com/orangecertcc/security-research/security/advisories/GHSA-f49v-45qp-cv53
redhat Patch Available

1549798 – (CVE-2018-7550) CVE-2018-7550 QEMU: i386: multiboot OOB access while loading kernel image

Affected: Red Hat Enterprise Linux 7

https://bugzilla.redhat.com/show_bug.cgi?id=1549798
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2018:2462
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2018:1369
generic

SecurityFocus

http://www.securityfocus.com/bid/103181

Vendor Advisories for CVE-2018-7550(4)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuqemu-utils (1:2.11+dfsg-1ubuntu7.1) @ bionic2026-05-28ubuntu
redhatqemu-kvm-10:1.5.3-156.el7_5.52018-08-16redhat
redhatqemu-kvm-rhev-10:2.10.0-21.el7_5.32018-05-22redhat
redhatqemu-kvm-rhev-10:2.10.0-21.el7_5.22018-05-10redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(8 across 7 ecosystems)
Debian:7(2)
PackageVulnerable rangeFixed inDependents
qemu1.1.2+dfsg-6+deb7u14 ... 1.1.2+dfsg-6a+deb7u9 (25 versions)1.1.2+dfsg-6+deb7u25—
qemu-kvm1.1.2+dfsg-6 ... 1.1.2+dfsg-6+deb7u9 (26 versions)1.1.2+dfsg-6+deb7u25—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
qemu—1:2.12~rc3+dfsg-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
qemu—1:2.12~rc3+dfsg-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
qemu—1:2.12~rc3+dfsg-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
qemu—1:2.12~rc3+dfsg-1—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
qemu1:2.1+dfsg-11 ... 1:2.1+dfsg-12~bpo70+1 (12 versions)1:2.1+dfsg-12+deb8u7—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
qemu1:2.8+dfsg-6, 1:2.8+dfsg-6+deb9u1, 1:2.8+dfsg-6+deb9u2, 1:2.8+dfsg-6+deb9u31:2.8+dfsg-6+deb9u4—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 4× in last 7d / 24× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 140 total refreshes for this CVE.

  1. 2026-09-06 13:44 UTCEPSS rescore
  2. 2026-09-04 13:56 UTCEPSS rescore
  3. 2026-09-04 05:02 UTCEPSS rescore
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  13. 2026-08-22 22:07 UTCOSV refresh
  14. 2026-08-21 23:45 UTCEPSS rescore
  15. 2026-08-20 22:51 UTCEPSS rescore
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  1. 2026-08-07 16:23 UTCEPSS rescore
  2. 2026-08-07 01:09 UTCOSV refresh
  3. 2026-08-06 13:42 UTCEPSS rescore
  4. 2026-08-04 15:05 UTCEPSS rescore
  5. 2026-08-04 10:33 UTCEPSS rescore
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  7. 2026-08-02 02:23 UTCEPSS rescore
  8. 2026-08-01 04:12 UTCEPSS rescore
  9. 2026-07-30 16:24 UTCEPSS rescore
  10. 2026-07-30 01:27 UTCEPSS rescore
  11. 2026-07-28 15:32 UTCEPSS rescore
  12. 2026-07-27 14:05 UTCEPSS rescore
  13. 2026-07-26 14:51 UTCEPSS rescore
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  18. 2026-07-23 14:15 UTCEPSS rescore
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  20. 2026-07-23 01:37 UTCEG score recompute
  21. 2026-07-22 22:17 UTCEG score recompute
  22. 2026-07-22 14:05 UTCEPSS rescore
  23. 2026-07-21 16:48 UTCOSV refresh
  24. 2026-07-21 15:22 UTCEPSS rescore
  25. 2026-07-20 17:04 UTCEPSS rescore
  26. 2026-07-20 17:04 UTCEPSS rescore
  27. 2026-07-19 14:28 UTCEPSS rescore
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  35. 2026-07-13 22:27 UTCEPSS rescore
  36. 2026-07-13 06:10 UTCEPSS rescore
  37. 2026-07-12 05:43 UTCEPSS rescore
  38. 2026-07-09 19:06 UTCEPSS rescore
  39. 2026-07-08 15:11 UTCEPSS rescore
  40. 2026-07-08 15:11 UTCEPSS rescore
  41. 2026-07-07 13:42 UTCEPSS rescore
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  43. 2026-07-06 16:25 UTCEPSS rescore
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  45. 2026-07-06 02:20 UTCEPSS rescore
  46. 2026-07-05 02:27 UTCEPSS rescore
  47. 2026-07-04 12:26 UTCOSV refresh
  48. 2026-07-04 06:28 UTCEPSS rescore
  49. 2026-07-04 06:28 UTCEPSS rescore
  50. 2026-07-01 15:03 UTCEPSS rescore
  51. 2026-07-01 15:03 UTCEPSS rescore
  52. 2026-06-30 23:20 UTCEPSS rescore
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  54. 2026-06-29 14:03 UTCEPSS rescore
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  74. 2026-06-18 17:50 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2018-7550?
CVE-2018-7550 is a high vulnerability published on March 1, 2018. The loadmultiboot 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 mhloadendaddr value greater than mhbssend_addr, which triggers an out-of-bounds read or write memory access.
When was CVE-2018-7550 disclosed?
CVE-2018-7550 was first published in the National Vulnerability Database on March 1, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-7550 actively exploited?
CVE-2018-7550 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.0% of all scored CVEs.
What is the CVSS score of CVE-2018-7550?
CVE-2018-7550 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2018-7550?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-7550, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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