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CVE-2023-6693

Published: 2 January 2024

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.

Notes

AuthorNote
mdeslaur
introduced in v5.1.0-rc0

Priority

Medium

Cvss 3 Severity Score

5.3

Score breakdown

Status

Package Release Status
qemu
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
jammy Needed

lunar Ignored
(end of life, was deferred [2024-01-12])
mantic Needed

trusty Not vulnerable
(code not present)
upstream Needs triage

xenial Not vulnerable
(code not present)
Patches:
upstream: https://gitlab.com/qemu-project/qemu/-/commit/2220e8189fb94068dbad333228659fbac819abb0

Severity score breakdown

Parameter Value
Base score 5.3
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact Low
Availability impact Low
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L