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.

Related CVEs

CVE-2023-6693

Key Information

GHSA ID

GHSA-835p-c6x8-xh5f

Published

January 2, 2024 12:30 PM

Last Modified

November 3, 2025 9:30 PM

CVSS Score

5.0 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: November 23, 2025 6:29 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.