CVE-2026-45782
Cloud Hypervisor: Use-after-free in virtio-block Async I/O Completion
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-416 |
| Vendor | cloud-hypervisor |
| Product | cloud-hypervisor |
| Published | Jun 9, 2026 |
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Affected Versions
cloud-hypervisor / cloud-hypervisor
>= 21.0, < 51.2
References
github.com: https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh github.com: https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220 github.com: https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa github.com: https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2 github.com: https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0