CVE-2026-45782
HighCVSS 8.9Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
Cloud Hypervisor versions 21.0 through before 51.2 allow a guest to trigger a use-after-free by submitting two virtio-block descriptor chains with the same head_index while asynchronous block I/O is enabled. Patched in versions 51.2 and 52.0.
Risk Assessment
A malicious virtual machine can cause a crash or potentially execute code in the cloud-hypervisor process, compromising isolation and stability of the cloud environment.
Recommendation
Update Cloud Hypervisor to version 51.2 or later immediately to fix the use-after-free vulnerability.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

