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VULNERABILITIES

CVE-2026-45782 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads. From version 21.0 to before version 51.2, a guest can cause a use-after-free in the cloud-hypervisor process by submitting two virtio-block descriptor chains that reuse the same head_index while asynchronous block I/O is enabled (e.g. io_uring, aio). When the kernel completes the duplicate operation before the original, the completion path frees a bounce buffer that the kernel is still actively reading from or writing to, corrupting the freed memory. This issue has been patched in versions 51.2 and 52.0.

Metrics

CVSS 3.x Severity and Vector Strings:

NDDVolerionCVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa [email protected]Source CodeVendor
https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220 [email protected]Issue TrackingVendor
https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2 [email protected]Release NotesVendor
https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0 [email protected]Release NotesVendor
https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh [email protected]AdvisoryRemedyVendor

Weakness Enumeration

CWE-IDCWE NameSource
CWE-416Use After Free[email protected]

Affected Products

ProductVersions
Cloud Hypervisor
>= 21.0, < 51.2

CPE

  • cpe:2.3:a:cloudhypervisor:cloud_hypervisor:*:*:*:*:*:rust:*:*

Remediation

  • Upgrade: 52.0moderate effort
  • Upgrade: 51.2moderate effort
  • Mitigation:low effort

    Disable asynchronous I/O on virtio-block devices by setting both _disable_io_uring=on and _disable_aio=on. This forces the synchronous backend, but may impact block I/O performance.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-45782
NVD Published Date:
Jun 10, 2026
NVD Last Modified:
Jul 23, 2026
Source:
[email protected]
CVE-2026-45782 Details - Not Deferred