High 8.9Published Jun 9, 2026

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

Updated under an hour ago (Oct 27, 2026, 6:30 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 8.9 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jun 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

cloud-hypervisor cloud-hypervisor cloud_hypervisor:cloud_hypervisor (from the name)	from 21.0, < 51.2	CNA record

References

References

https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh	x-refsource-confirm
https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220	x-refsource-misc
https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa	x-refsource-misc
https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2	x-refsource-misc
https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.