CVE-2023-6693: Fedoraproject Fedora

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Fedoraproject Fedora: version 39 only
• Qemu Qemu: before 8.2.1 (fixed in 8.2.1)
• Red Hat Enterprise Linux: version 8.0 only; version 9.0 only

Published 2024-01-02. Last modified 2026-06-17.