Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
cloud-hypervisor cloud-hypervisor
>= 21.0, < 51.2affected
References
- https://github.com/cloud-hypervisor/cloud-hypervisor/security/advisories/GHSA-f47p-p25q-83rh ↗
- https://github.com/cloud-hypervisor/cloud-hypervisor/pull/8220 ↗
- https://github.com/cloud-hypervisor/cloud-hypervisor/commit/1314ac883c641f1045bbb06dec0de045a3894baa ↗
- https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v51.2 ↗
- https://github.com/cloud-hypervisor/cloud-hypervisor/releases/tag/v52.0 ↗