CVE-2026-81627

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 92% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A flaw was found in QEMU. The VAPIC setup hypercall in hw/i386/vapic.c does not validate that the writable RAM alias remains within the option ROM window. A privileged guest user on a Q35/KVM machine can position this alias over locked SMRAM, bypassing chipset D_LCK protection and injecting code into System Management Mode memory.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
53(Track*)
EG Risk 53/100SSVC: 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
Severity82% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

September 18, 2026

Last Modified

September 21, 2026

Advisory Details (3)

Auto-updated Sep 18, 2026
Patch available. Sources: redhat.
generic

VAPIC writable ROM alias can escape the option-ROM window and expose locked SMRAM (#4206) · Issues · QEMU / QEMU · GitLab

https://gitlab.com/qemu-project/qemu/-/work_items/4206
redhat

2536950 – (CVE-2026-81627) CVE-2026-81627 qemu-kvm: VAPIC writable ROM alias can escape the option-ROM window and expose locked SMRAM

https://bugzilla.redhat.com/show_bug.cgi?id=2536950
redhat Patch Available

CVE-2026-81627 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-81627

Vendor Advisories for CVE-2026-81627(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 32× in last 7d / 35× 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.

  1. 2026-09-25 06:55 UTCGHSA enrichment
  2. 2026-09-24 19:37 UTCEG score recompute
  3. 2026-09-24 19:37 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 08:19 UTCGHSA enrichment
  6. 2026-09-23 21:01 UTCEG score recompute
  7. 2026-09-23 21:01 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 09:43 UTCGHSA enrichment
  10. 2026-09-22 22:25 UTCEG score recompute
  11. 2026-09-22 22:25 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 11:06 UTCGHSA enrichment
  14. 2026-09-21 23:48 UTCEG score recompute
  15. 2026-09-21 23:48 UTCGHSA enrichment
  16. 2026-09-21 21:09 UTCEPSS rescore
  17. 2026-09-21 12:30 UTCEG score recompute
  18. 2026-09-21 12:30 UTCGHSA enrichment
  19. 2026-09-21 11:45 UTCGHSA enrichment
  20. 2026-09-21 11:25 UTCEG score recompute▲ 1.50
  21. 2026-09-21 11:25 UTCGHSA enrichment
  22. 2026-09-21 11:25 UTCMITRE cvelistV5CVSS v3 → 8.2 · severity → HIGH
  23. 2026-09-20 23:33 UTCEG score recompute
  24. 2026-09-20 23:33 UTCGHSA enrichment
  25. 2026-09-20 20:16 UTCEPSS rescore
Show 10 more
  1. 2026-09-19 21:20 UTCEG score recompute
  2. 2026-09-19 21:20 UTCGHSA enrichment
  3. 2026-09-18 19:08 UTCGHSA enrichment
  4. 2026-09-18 16:27 UTCEG score recompute
  5. 2026-09-18 16:27 UTCGHSA enrichment
  6. 2026-09-18 15:25 UTCEG score recompute
  7. 2026-09-18 15:25 UTCGHSA enrichment
  8. 2026-09-18 11:20 UTCEG score recompute
  9. 2026-09-18 11:04 UTCEG score recompute
  10. 2026-09-18 11:04 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-81627?
CVE-2026-81627 is a high vulnerability published on September 18, 2026. A flaw was found in QEMU. The VAPIC setup hypercall in hw/i386/vapic.c does not validate that the writable RAM alias remains within the option ROM window. A privileged guest user on a Q35/KVM machine can position this alias over locked SMRAM, bypassing chipset D_LCK protection and injecting code…
When was CVE-2026-81627 disclosed?
CVE-2026-81627 was first published in the National Vulnerability Database on September 18, 2026, with the most recent update on September 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81627 actively exploited?
CVE-2026-81627 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 92.2% of all scored CVEs.
What is the CVSS score of CVE-2026-81627?
CVE-2026-81627 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-81627?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81627, 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

Explore the affected products and dependency analysis for CVE-2026-81627

Explore →

Is Your Infrastructure Affected by CVE-2026-81627?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs