CVE-2021-3929

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.

References

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XHNN7QJCEQH7AQG5AQP2GEFAQE6K635I/

https://gitlab.com/qemu-project/qemu/-/issues/782

https://gitlab.com/qemu-project/qemu/-/issues/556

https://gitlab.com/qemu-project/qemu/-/commit/736b01642d85be832385

https://bugzilla.redhat.com/show_bug.cgi?id=2020298

https://access.redhat.com/security/cve/CVE-2021-3929

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3