Vulnerability Description
A stack based buffer overflow was found in the virtio-net device of QEMU. This issue occurs when flushing TX in the virtio_net_flush_tx function if guest features VIRTIO_NET_F_HASH_REPORT, VIRTIO_F_VERSION_1 and VIRTIO_NET_F_MRG_RXBUF are enabled. This could allow a malicious user to overwrite local variables allocated on the stack. Specifically, the `out_sg` variable could be used to read a part of process memory and send it to the wire, causing an information leak.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Qemu | Qemu | < 8.2.1 |
| Redhat | Enterprise Linux | 8.0 |
| Fedoraproject | Fedora | 39 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2024:2962
- https://access.redhat.com/errata/RHSA-2025:4492
- https://access.redhat.com/security/cve/CVE-2023-6693Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2254580Issue TrackingPatch
- https://access.redhat.com/errata/RHSA-2024:2962
- https://access.redhat.com/security/cve/CVE-2023-6693Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2254580Issue TrackingPatch
- https://lists.debian.org/debian-lts-announce/2025/04/msg00042.html
- https://lists.fedoraproject.org/archives/list/[email protected]
- https://security.netapp.com/advisory/ntap-20240208-0004/
FAQ
What is CVE-2023-6693?
CVE-2023-6693 is a vulnerability with a CVSS score of 4.9 (MEDIUM). A stack based buffer overflow was found in the virtio-net device of QEMU. This issue occurs when flushing TX in the virtio_net_flush_tx function if guest features VIRTIO_NET_F_HASH_REPORT, VIRTIO_F_VE...
How severe is CVE-2023-6693?
CVE-2023-6693 has been rated MEDIUM with a CVSS base score of 4.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-6693?
Check the references section above for vendor advisories and patch information. Affected products include: Qemu Qemu, Redhat Enterprise Linux, Fedoraproject Fedora.