CVE-2026-6426

MEDIUMPre-NVD 4.44.4—
EchelonGraph scoreMEDIUM confidence

Score 4.4 from GitHub Security Advisory published 2026-08-11. A secondary CVSS source baseline 4.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 4.4Exploit: None knownExposed services: Not assessed

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

A type mismatch vulnerability was found in QEMU's vhost inflight migration VMState handling. The destination buffer size is stored as a uint64_t but read by the VMS_VBUFFER load path as a signed int32_t. On little-endian hosts, a crafted incoming migration state with bit 31 set causes the value to be interpreted as negative and then implicitly converted to a very large size_t, leading qemu_get_buffer() to copy migration-stream data beyond the bounds of the mmap-backed inflight region.

This can result in a crash of the QEMU process or memory corruption. Exploitation requires control of the migration producer or write access to the migration channel, combined with a destination configured to use vhost inflight migration.

CVSS v3
4.4
EG Score
4.4MEDIUMmedium confidence
EG Risk
20
EG Risk 20/100CISA SSVC

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
Severity44% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
31st
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 10, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Aug 10, 2026
No fix on record yet. Sources: redhat.
redhat

2513498 – (CVE-2026-6426) CVE-2026-6426 qemu-kvm: vhost inflight migration VMState integer type mismatch causes out-of-bounds access

https://bugzilla.redhat.com/show_bug.cgi?id=2513498
redhatMentions a patch (unverified)

CVE-2026-6426 - 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-2026-6426

Vendor Advisories for CVE-2026-6426(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
qemu1:10.0.0+ds-1 ... 1:9.2.2+ds-1~bpo12+1 (200 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
qemu1:10.0.10+ds-0+deb13u1 ... 1:11.1.2+ds-1 (67 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
qemu1:10.0.2+ds-2 ... 1:11.1.2+ds-1 (57 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 72× 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 166 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:13 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 18:12 UTCEG score recompute
  5. 2026-10-06 18:12 UTCGHSA enrichment
  6. 2026-10-06 15:18 UTCEPSS rescore
  7. 2026-10-05 17:43 UTCEPSS rescore
  8. 2026-10-04 23:22 UTCEPSS rescore
  9. 2026-10-04 22:49 UTCGHSA enrichment
  10. 2026-10-03 21:48 UTCEG score recompute
  11. 2026-10-03 14:26 UTCEPSS rescore
  12. 2026-10-02 17:56 UTCEPSS rescore
  13. 2026-10-02 09:16 UTCEG score recompute
  14. 2026-10-02 09:16 UTCGHSA enrichment
  15. 2026-10-01 19:50 UTCEPSS rescore
  16. 2026-09-30 22:24 UTCEG score recompute
  17. 2026-09-30 22:24 UTCGHSA enrichment
  18. 2026-09-30 15:03 UTCEPSS rescore
  19. 2026-09-29 08:20 UTCEG score recompute
  20. 2026-09-29 08:20 UTCGHSA enrichment
  21. 2026-09-28 13:52 UTCEPSS rescore
  22. 2026-09-28 09:39 UTCEG score recompute
  23. 2026-09-28 09:39 UTCGHSA enrichment
  24. 2026-09-27 13:48 UTCEPSS rescore
  25. 2026-09-27 11:05 UTCEG score recompute
Show 75 more
  1. 2026-09-27 11:05 UTCGHSA enrichment
  2. 2026-09-26 15:59 UTCEPSS rescore
  3. 2026-09-25 05:55 UTCEG score recompute
  4. 2026-09-25 05:55 UTCGHSA enrichment
  5. 2026-09-24 07:21 UTCEG score recompute
  6. 2026-09-24 07:21 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 08:42 UTCEG score recompute
  9. 2026-09-23 08:42 UTCGHSA enrichment
  10. 2026-09-22 10:08 UTCEG score recompute
  11. 2026-09-22 10:08 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 11:05 UTCEG score recompute
  14. 2026-09-21 11:05 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 11:02 UTCEG score recompute
  17. 2026-09-20 11:02 UTCGHSA enrichment
  18. 2026-09-19 12:28 UTCEG score recompute
  19. 2026-09-19 12:28 UTCGHSA enrichment
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 11:20 UTCEG score recompute
  22. 2026-09-18 11:20 UTCGHSA enrichment
  23. 2026-09-18 10:54 UTCEG score recompute
  24. 2026-09-18 10:54 UTCGHSA enrichment
  25. 2026-09-18 00:48 UTCEG score recompute
  26. 2026-09-18 00:48 UTCGHSA enrichment
  27. 2026-09-17 00:55 UTCEG score recompute
  28. 2026-09-17 00:55 UTCGHSA enrichment
  29. 2026-09-16 14:08 UTCEPSS rescore
  30. 2026-09-16 05:15 UTCEPSS rescore
  31. 2026-09-16 02:21 UTCEG score recompute
  32. 2026-09-16 02:21 UTCGHSA enrichment
  33. 2026-09-15 03:12 UTCEPSS rescore
  34. 2026-09-14 22:50 UTCGHSA enrichment
  35. 2026-09-13 22:43 UTCEG score recompute
  36. 2026-09-13 22:43 UTCGHSA enrichment
  37. 2026-09-13 00:09 UTCEG score recompute
  38. 2026-09-13 00:09 UTCGHSA enrichment
  39. 2026-09-12 15:02 UTCEPSS rescore
  40. 2026-09-12 01:35 UTCEG score recompute
  41. 2026-09-12 01:35 UTCGHSA enrichment
  42. 2026-09-11 14:53 UTCEPSS rescore
  43. 2026-09-11 09:37 UTCEPSS rescore
  44. 2026-09-11 02:58 UTCEG score recompute
  45. 2026-09-11 02:58 UTCGHSA enrichment
  46. 2026-09-10 04:23 UTCEG score recompute
  47. 2026-09-10 04:23 UTCGHSA enrichment
  48. 2026-09-09 05:49 UTCEG score recompute
  49. 2026-09-09 05:49 UTCGHSA enrichment
  50. 2026-09-08 22:01 UTCEPSS rescore
  51. 2026-09-07 21:46 UTCEG score recompute
  52. 2026-09-07 21:46 UTCGHSA enrichment
  53. 2026-09-07 16:01 UTCEPSS rescore
  54. 2026-09-06 23:12 UTCEG score recompute
  55. 2026-09-06 23:12 UTCGHSA enrichment
  56. 2026-09-06 13:47 UTCEPSS rescore
  57. 2026-09-06 00:24 UTCEG score recompute
  58. 2026-09-06 00:24 UTCGHSA enrichment
  59. 2026-09-05 15:31 UTCEPSS rescore
  60. 2026-09-05 01:50 UTCEG score recompute
  61. 2026-09-05 01:50 UTCGHSA enrichment
  62. 2026-09-04 05:07 UTCEPSS rescore
  63. 2026-09-04 01:56 UTCGHSA enrichment
  64. 2026-09-03 01:59 UTCEG score recompute
  65. 2026-09-03 01:59 UTCGHSA enrichment
  66. 2026-09-02 14:12 UTCEPSS rescore
  67. 2026-09-01 17:19 UTCEG score recompute
  68. 2026-09-01 17:19 UTCGHSA enrichment
  69. 2026-09-01 13:54 UTCEPSS rescore
  70. 2026-09-01 04:40 UTCEPSS rescore
  71. 2026-08-31 18:36 UTCEG score recompute
  72. 2026-08-31 18:35 UTCGHSA enrichment
  73. 2026-08-31 17:32 UTCEG score recompute
  74. 2026-08-31 17:31 UTCGHSA enrichment
  75. 2026-08-31 16:40 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-6426?
CVE-2026-6426 is a medium vulnerability published on August 10, 2026. A type mismatch vulnerability was found in QEMU's vhost inflight migration VMState handling. The destination buffer size is stored as a uint64t but read by the VMSVBUFFER load path as a signed int32t. On little-endian hosts, a crafted incoming migration state with bit 31 set causes the value to be…
When was CVE-2026-6426 disclosed?
CVE-2026-6426 was first published on August 10, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6426 actively exploited?
CVE-2026-6426 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (31st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-6426?
CVE-2026-6426 has a CVSS base score of 4.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-6426?
No fix for CVE-2026-6426 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-6426 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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