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PatchSiren cyber security CVE debrief

CVE-2026-45782 cloud-hypervisor CVE debrief

CVE-2026-45782 is a high-severity vulnerability in Cloud Hypervisor, 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.

Vendor
cloud-hypervisor
Product
Unknown
CVSS
HIGH 8.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-10
Advisory published
2026-06-10
Advisory updated
2026-06-10

Who should care

Users of Cloud Hypervisor versions between 21.0 and 51.2 should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability is caused by a use-after-free error in the cloud-hypervisor process. A guest can exploit this vulnerability by submitting two virtio-block descriptor chains that reuse the same head_index while asynchronous block I/O is enabled. This can lead to memory corruption and potentially allow for code execution.

Defensive priority

High

Recommended defensive actions

  • Upgrade to Cloud Hypervisor version 51.2 or 52.0, which patches this vulnerability.
  • Review and update your Cloud Hypervisor deployment to ensure you are running a patched version.

Evidence notes

This vulnerability has been patched in Cloud Hypervisor versions 51.2 and 52.0. Users can refer to the official Cloud Hypervisor releases for more information: [ref-6](https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2), [ref-7](https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45782 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45782

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-45782 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45782

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.