CVE-2021-3929 Information

Description

A DMA reentrancy issue was found in the NVM Express Controller (NVME) emulation in QEMU. This CVE is similar to CVE-2021-3750 and just like it when the reentrancy write triggers the reset function nvme_ctrl_reset() data structs will be freed leading to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host resulting in a denial of service condition or potentially executing arbitrary code within the context of the QEMU process on the host.

Reference

https://gitlab.com/qemu-project/qemu/-/commit/736b01642d85be832385 https://bugzilla.redhat.com/show_bug.cgi?id=2020298 https://gitlab.com/qemu-project/qemu/-/issues/556 https://access.redhat.com/security/cve/CVE-2021-3929 https://gitlab.com/qemu-project/qemu/-/issues/782