CVE-2026-42489

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-06-18. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: <0.1%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]

To create and manage guests, domctl operations are used by the control domain, a possible Xenstore domain, or by a domain controlling a particular guest. Some of these operations may not be executed in parallel, so a system-wide lock is used. The way that lock is acquired is, however, not providing any fairness. This is CVE-2026-42489.

Furthermore, with XSM/Flask in use, the lock acquire will, for some operations, occur ahead of any permission checking. This is CVE-2026-42490.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100

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
Severity53% × 45%
Exploitation0% × 40%
Automatability30% × 15%
EPSS PROB
<0.1%
EPSS %ILE
below the 1st
KEV
Not listed

Published

June 18, 2026

Last Modified

June 22, 2026

Advisory Details (1)

Auto-updated Jun 21, 2026
Patch available.
generic

XSA-492 - Xen Security Advisories

https://xenbits.xenproject.org/xsa/advisory-492.html

Vendor Advisories for CVE-2026-42489(1)

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

Affected Packages

(9 across 9 ecosystems)
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • every version up to 4.18.5-r9: fixed in 4.18.5-r9
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • every version up to 4.19.5-r4: fixed in 4.19.5-r4
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • every version up to 4.20.3-r4: fixed in 4.20.3-r4
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • every version up to 4.20.3-r4: fixed in 4.20.3-r4
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
xen—
  • every version up to 4.21.1-r6: fixed in 4.21.1-r6
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
xen4.14.2+25-gb6a8c4f72d-2 ... 4.20.3+127-gc42374a105-1 (46 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
xen4.17.1+2-gb773c48e36-1 ... 4.17.5+72-g01140da4e8-1 (14 versions)
  • every version up to 4.17.7-0+deb12u1: fixed in 4.17.7-0+deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
xen4.20.0+68-g35cb38b222-1 ... 4.20.2+7-g1badcf5035-2 (6 versions)
  • every version up to 4.20.3+127-gc42374a105-0+deb13u1: fixed in 4.20.3+127-gc42374a105-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
xen4.20.0+68-g35cb38b222-1, 4.20.2+37-g61ff35323e-1, 4.20.2+7-g1badcf5035-1, 4.20.2+7-g1badcf5035-2
  • every version up to 4.20.3+127-gc42374a105-1: fixed in 4.20.3+127-gc42374a105-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 15× 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 124 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-42489?
CVE-2026-42489 is a medium vulnerability published on June 18, 2026. [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] To create and manage guests, domctl operations are used by the control domain, a possible Xenstore domain, or by a domain controlling a particular guest. Some of these…
When was CVE-2026-42489 disclosed?
CVE-2026-42489 was first published on June 18, 2026, with the most recent update on June 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42489 actively exploited?
CVE-2026-42489 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a <0.1% probability of exploitation in the next 30 days (below the 1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-42489?
CVE-2026-42489 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42489?
A fix for CVE-2026-42489 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-42489 are linked in the Vendor Advisories panel on this page.

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