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%CVSS: 4.4Exploit: None knownExposed: 0

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

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
4.4(medium)
EG Risk
20(Track)
EG Risk 20/100SSVC: 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
Severity44% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

August 10, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Aug 10, 2026
Patch available. 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
redhat Patch Available

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 rangeFixed inDependents
qemu1:10.0.0+ds-1 ... 1:9.2.2+ds-1~bpo12+1 (199 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
qemu1:10.0.10+ds-0+deb13u1 ... 1:11.1.1+ds-1 (65 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
qemu1:10.0.2+ds-2 ... 1:11.1.1+ds-1 (56 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 90× 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 122 total refreshes for this CVE.

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

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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 84.7% of all scored CVEs.
What is the CVSS score of CVE-2026-6426?
CVE-2026-6426 has a CVSS v3 base score of 4.4 (NVD).
How do I remediate CVE-2026-6426?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6426, 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.

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