CVSS 4.0
8.9 highCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:HCVE-2026-45782
High (8.9). EPSS 0.1% chance of exploitation in the next 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.
Severity
- EPSS
- 0.1% chance of exploitation in the next 30 days; higher than 3% of CVEs (scores of 2026-10-31)
- CWE
- CWE-416
- Published
- Modified
- Record from
- the NVD, synced
References
- https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa
- https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220
- https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2
- https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0
- https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh