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.
Problem types
Product status
References
github.com/...rvisor/security/advisories/GHSA-f47p-p25q-83rh
github.com/cloud-hypervisor/cloud-hypervisor/pull/8220
github.com/...ommit/1314ac883c641f1045bbb06dec0de045a3894baa
github.com/...hypervisor/cloud-hypervisor/releases/tag/v51.2
github.com/...hypervisor/cloud-hypervisor/releases/tag/v52.0