CVE-2026-62432

Hypervisor crash via FIFO event-channel state race

Published Jul 28, 2026 · Updated Jul 28, 2026

Race condition in Xen 4.5 and later allows guest OS users to crash the hypervisor through concurrent event-channel hypercalls. EVTCHNOP_expand_array reads the FIFO-enabled state without the required event-channel lock, allowing EVTCHNOP_reset to clear the backing array before it is dereferenced. Any malicious HVM guest on x86 or Arm can cause a host-wide service interruption; for x86 PV guests, memory corruption and privilege escalation remain unresolved potential impacts.

CVSS severity7.3
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Xen 4.5 and later allows guest OS users to crash the hypervisor through concurrent event-channel hypercalls. EVTCHNOP_expand_array reads the FIFO-enabled state without the required event-channel lock, allowing EVTCHNOP_reset to clear the backing array before it is dereferenced. Any malicious HVM guest on x86 or Arm can cause a host-wide service interruption; for x86 PV guests, memory corruption and privilege escalation remain unresolved potential impacts.

The record

CVE
CVE-2026-62432
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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