CVE-2021-3929: Fedoraproject Fedora

High severity, CVSS 8.2. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Fedoraproject Fedora: version 35 only; version 36 only
• Qemu Qemu: before 7.0.0 (fixed in 7.0.0)

Published 2022-08-25. Last modified 2026-06-17.