virtio-win Memory Safety Issues

Buffer overflow in virtio-win's RhelDoUnMap() function allows local privileged users to trigger a denial of service by supplying an excessive number of descriptors during unmap operations, causing system crashes. Affects Red Hat Enterprise Linux 8, 9, and 10 across multiple architectures. The vulnerability requires high-level privilege (PR:H) but offers no confidentiality or integrity protections beyond the immediate DoS impact, with a CVSS score of 6.7 reflecting the local attack requirement and high-privilege barrier.

VirtIO Block device driver in virtio-win fails to properly release memory during device reset, enabling a use-after-free vulnerability that allows high-privileged local attackers to corrupt kernel memory and cause system instability or denial of service. Affected versions span Red Hat Enterprise Linux 8, 9, and 10; no public exploit code or active exploitation has been identified at time of analysis, though upstream fix is available via GitHub PR.