CVE-2026-62427 (GCVE-0-2026-62427)
Vulnerability from cvelistv5 – Published: 2026-07-28 12:31 – Updated: 2026-07-28 15:54
VLAI
EPSS
VEX
Title
sysctl and platform-op locks open to abuse
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
To manage the system, sysctl and platform operations are used by the
control domain or a possible Xenstore domain. Some of these operations
may not be executed in parallel, so a system-wide lock each is used.
The way those locks are acquired is, however, not providing any fairness.
Furthermore, with XSM/Flask in use, the lock acquire will, for some
operations, occur ahead of any permission checking.
The sysctl issue is CVE-2026-62426.
The platform-op issue is CVE-2026-62427.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
1 reference
Date Public
2026-07-28 12:00
Credits
{
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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"timestamp": "2026-07-28T15:54:13.421567Z",
"version": "2.0.3"
},
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"title": "CISA ADP Vulnrichment"
}
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"cna": {
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"product": "Xen",
"vendor": "Xen",
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"status": "unknown",
"version": "consult Xen advisory XSA-499"
}
]
}
],
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"value": "All Xen versions from 4.0 onwards are vulnerable. Earlier versions use\na different locking operation, but may also be vulnerable."
}
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"type": "finder",
"value": "This issue was discovered by Jan Beulich of SUSE."
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"descriptions": [
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"lang": "en",
"value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nTo manage the system, sysctl and platform operations are used by the\ncontrol domain or a possible Xenstore domain. Some of these operations\nmay not be executed in parallel, so a system-wide lock each is used.\nThe way those locks are acquired is, however, not providing any fairness.\nFurthermore, with XSM/Flask in use, the lock acquire will, for some\noperations, occur ahead of any permission checking.\n\nThe sysctl issue is CVE-2026-62426.\n\nThe platform-op issue is CVE-2026-62427."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A less privileged entity may stall an equally or more privileged entity,\npotentially leading to a Denial od Service (DoS) of up to the entire\nhost."
}
]
}
],
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"dateUpdated": "2026-07-28T12:31:57.645Z",
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"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-499.html"
}
],
"title": "sysctl and platform-op locks open to abuse",
"workarounds": [
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"value": "There is no known mitigation."
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"dateReserved": "2026-07-14T10:28:12.655Z",
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"state": "PUBLISHED"
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"vulnerability-lookup:meta": {
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"id": "CVE-2026-62427",
"initial_release_date": "2026-07-28T12:31:57.645000+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "xen: Xen: Platform operation lock bypass leading to unauthorized access or denial of service",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-62427.json",
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"id": "CVE-2026-62427",
"initial_release_date": "2026-07-28T17:10:03Z",
"product_status:first_fixed": "87",
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"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-62427",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-62427.json",
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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