CVE-2026-45782

Guest-to-host code execution via duplicate descriptor reuse

Published Jun 9, 2026 · Updated Jun 9, 2026

Use-after-free in Cloud Hypervisor 21.0 through 51.1 allows guest OS users to execute code on the host via duplicate virtio-block chains. The async virtio-block submit path accepts two in-flight chains with the same head_index, so completion matches the wrong request and frees a bounce buffer still used by kernel I/O. Asynchronous virtio-block I/O is enabled by default, and an unaligned read or write provides memory corruption in the VMM process.

CVSS severity8.9
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Cloud Hypervisor 21.0 through 51.1 allows guest OS users to execute code on the host via duplicate virtio-block chains. The async virtio-block submit path accepts two in-flight chains with the same head_index, so completion matches the wrong request and frees a bounce buffer still used by kernel I/O. Asynchronous virtio-block I/O is enabled by default, and an unaligned read or write provides memory corruption in the VMM process.

The record

CVE
CVE-2026-45782
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
Cloud Hypervisor
Product
Cloud Hypervisor
Classifications
CWE-416, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 21.0, < 51.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Cloud Hypervisor · Cloud Hypervisorversion=>= 21.0, < 51.2

Published CVSS scores

8.9GitHubCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

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.

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No observations available

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

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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