CVE-2023-6693 Qemu: virtio-net: stack buffer overflow in virtio_net_flush_tx()

What is CVE-2023-6693?

CVE-2023-6693 is a medium-severity memory corruption vulnerability in Fedoraproject Fedora, published on 2 Jan 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-787, CWE-121

Which versions are affected by CVE-2023-6693?

It affects 3 products.

Products include Fedoraproject Fedora, Qemu Qemu, Redhat Enterprise Linux.

How do I fix CVE-2023-6693?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2023-6693 being exploited?

There is no known exploitation of CVE-2023-6693 in the wild and no public exploit code.

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Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-35675, AZL-35676, BELL-CVE-2023-6693, CLSA-2026-1779097389, DEBIAN-CVE-2023-6693, GHSA-835p-c6x8-xh5f and 2 more.