CVE-2026-45782
Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion
- State
- Published
- Severity
- 8.9 High
- Published
- Jun 9, 2026
- Updated
- Jun 10, 2026
- Reserved
- May 13, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.9 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 | GitHub_M |
Weaknesses
- CWE-416 Use After Free
Affected Products
| Product | Versions |
|---|---|
cloud-hypervisorcloud-hypervisor |
|
References
- https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh
- https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220
- https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa
- https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2
- https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0
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