CVE details
CVE-2023-6693
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 ports (2)
| Port | Package | Version | Status | Maintainer |
|---|---|---|---|---|
| emulators/qemu-cheri | qemu-cheri | 0.d20260108 | unaddressed | brooks@FreeBSD.org |
| emulators/qemu-user-static | qemu-user-static | 3.1.0_16 | unaddressed | emulation@FreeBSD.org |
Template for a VuXML entry
Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.
<vuln vid="FIXME (make newentry)">
<topic>FIXME -- FIXME</topic>
<affects>
<package>
<name>qemu-cheri</name>
<range><lt>8.2.1</lt></range>
</package>
<package>
<name>qemu-user-static</name>
<range><lt>8.2.1</lt></range>
</package>
</affects>
<description>
<body xmlns="http://www.w3.org/1999/xhtml">
<p>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.</p>
</body>
</description>
<references>
<cvename>CVE-2023-6693</cvename>
<url>https://nvd.nist.gov/vuln/detail/CVE-2023-6693</url>
</references>
<dates>
<discovery>2024-01-02</discovery>
<entry>2026-10-25</entry>
</dates>
</vuln>