Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Qemu | Qemu | >= 0.10.0, < 6.2.0 |
| Debian | Debian Linux | 9.0 |
| Canonical | Ubuntu Linux | 18.04 |
| Fedoraproject | Fedora | 34 |
| Redhat | Enterprise Linux | 8.0 |
| Redhat | Enterprise Linux Advanced Virtualization Eus | 8.4 |
Related Weaknesses (CWE)
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1998514Issue TrackingPatchThird Party Advisory
- https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6PatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/04/msg00002.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing ListThird Party Advisory
- https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.htmlMailing ListPatchThird Party Advisory
- https://security.gentoo.org/glsa/202208-27Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220425-0004/Third Party Advisory
- https://ubuntu.com/security/CVE-2021-3748PatchThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1998514Issue TrackingPatchThird Party Advisory
- https://github.com/qemu/qemu/commit/bedd7e93d01961fcb16a97ae45d93acf357e11f6PatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/04/msg00002.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing ListThird Party Advisory
- https://lists.nongnu.org/archive/html/qemu-devel/2021-09/msg00388.htmlMailing ListPatchThird Party Advisory
- https://security.gentoo.org/glsa/202208-27Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220425-0004/Third Party Advisory
FAQ
What is CVE-2021-3748?
CVE-2021-3748 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2021-3748?
CVE-2021-3748 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-3748?
Check the references section above for vendor advisories and patch information. Affected products include: Qemu Qemu, Debian Debian Linux, Canonical Ubuntu Linux, Fedoraproject Fedora, Redhat Enterprise Linux.