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.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| https://gitlab.com/qemu-project/qemu/-/issues/556 | third party advisory issue tracking |
| https://bugzilla.redhat.com/show_bug.cgi?id=2020298 | patch third party advisory issue tracking |
| https://access.redhat.com/security/cve/CVE-2021-3929 | third party advisory |
| https://gitlab.com/qemu-project/qemu/-/issues/782 | patch exploit third party advisory issue tracking |
| https://gitlab.com/qemu-project/qemu/-/commit/736b01642d85be832385 | third party advisory patch |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XHNN7QJCEQH7AQG5AQP2GEFAQE6K635I/ | vendor advisory |
| https://security.netapp.com/advisory/ntap-20250228-0010/ |