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.
CVE-2023-6693
CVSS base score
4.9 (v3.1)
Severity
MEDIUM
Attack vector
Local
Weakness
CWE-121, CWE-787
Last modified
November 5, 2026
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Affected products
qemu qemu
redhat enterprise linux
fedoraproject fedora
References
- access.redhat.com
- access.redhat.com
- access.redhat.com Third Party Advisory
- bugzilla.redhat.com Issue Tracking, Patch
- access.redhat.com
- access.redhat.com Third Party Advisory
- bugzilla.redhat.com Issue Tracking, Patch
- lists.debian.org
- lists.fedoraproject.org
- security.netapp.com