Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion_CVE-2026-45782

8.9 / 10

HIGH

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

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.

AI Analysis

Use-after-free vulnerability in virtio-block async I/O completion

Basic Information

ID CVE-2026-45782

Source GitHub_M

Published Jun 9, 2026 at 22:53

Affected Product

Vendor cloud-hypervisor

Product cloud-hypervisor

Version >= 21.0, < 51.2

Affected Versions cloud-hypervisor cloud-hypervisor >= 21.0, < 51.2

CWE Classification

CWE-416

AI Assessment

AI Score 8.9 / 10

AI Severity High

Vendor Cloud Hypervisor Project

Product Cloud Hypervisor

Version 21.0 to 51.2

References

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    "published": "2026-06-09T22:53:52.657Z",
    "modified": "2026-06-09T22:53:52.657Z",
    "type": "cve",
    "title": "Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion",
    "source": "GitHub_M",
    "references": "https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh\nhttps://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220\nhttps://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa\nhttps://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2\nhttps://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0",
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