CVE-2026-42492

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-28. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

Xenstore, to have an up-to-date picture of the entire system, wants to know of domains appearing and disappearing. To make this more robust, a new XEN_DOMCTL_get_domain_state was introduced. The management of the bitmap underlying that operation is tied into the binding of the VIRQ_DOM_EXC virtual IRQ. Unfortunately an error path there would tear down the bitmap even in cases when it wasn't set up. Unprivileged domains can trigger that error path.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

July 28, 2026

Last Modified

July 28, 2026

Advisory Details (2)

Auto-updated Jul 28, 2026
No patch confirmed yet.
generic

XSA-496 - Xen Security Advisories

http://xenbits.xen.org/xsa/advisory-496.html
generic

XSA-496 - Xen Security Advisories

https://xenbits.xenproject.org/xsa/advisory-496.html

Vendor Advisories for CVE-2026-42492(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 23× in last 7d / 110× 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 131 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-42492?
CVE-2026-42492 is a high vulnerability published on July 28, 2026. Xenstore, to have an up-to-date picture of the entire system, wants to know of domains appearing and disappearing. To make this more robust, a new XENDOMCTLgetdomainstate was introduced. The management of the bitmap underlying that operation is tied into the binding of the VIRQDOMEXC virtual IRQ.…
When was CVE-2026-42492 disclosed?
CVE-2026-42492 was first published in the National Vulnerability Database on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42492 actively exploited?
CVE-2026-42492 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 62.0% of all scored CVEs.
What is the CVSS score of CVE-2026-42492?
CVE-2026-42492 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42492?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42492, 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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