CVE-2021-3748
High
Description
A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Qemu
PublishedMar 23, 2022
First seenMar 23, 2022
Weakness typeCWE-416Use after free
How to fix
Update
- qemu qemu6.2.0 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| qemu qemu | 0.10.0 ≤ v < 6.2.0 | 6.2.0 |
| debian debian_linux | 9.0, 10.0 | — |
| canonical ubuntu_linux | 18.04, 20.04, 21.10 | — |
| fedoraproject fedora | 34 | — |
| redhat enterprise_linux | 8.0 | — |
| redhat enterprise_linux_advanced_virtualization_eus | 8.4 | — |
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