CVE-2021-3929
High
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.
SeverityHigh
CVSS8.2
Exploit probability—
Product
Qemu
PublishedAug 25, 2022
First seenAug 25, 2022
Weakness typeCWE-416Use after free
How to fix
Update
- qemu qemu7.0.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| qemu qemu | v < 7.0.0 | 7.0.0 |
| fedoraproject fedora | 35, 36 | — |
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