CVE-2023-6693
Qemu: virtio-net: stack buffer overflow in virtio_net_flush_tx()
CVSS Score
4.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-121 |
| Vendor | red hat |
| Product | red hat enterprise linux 8 |
| Published | Jan 2, 2024 |
| Last Updated | Feb 25, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low
Affected Versions
Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 8 Advanced Virtualization
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2024:2962 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:4492 access.redhat.com: https://access.redhat.com/security/cve/CVE-2023-6693 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2254580 lists.fedoraproject.org: https://lists.fedoraproject.org/archives/list/[email protected]/message/OYGUN5HVOXESW7MSNM44E4AE2VNXQB6Y/ security.netapp.com: https://security.netapp.com/advisory/ntap-20240208-0004/ lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/04/msg00042.html
Credits
Red Hat would like to thank Xiao Lei (Zhejiang University) for reporting this issue.