CVE-2023-6693
Qemu: virtio-net: stack buffer overflow in virtio_net_flush_tx()
- Published
- Updated
- Reserved
- Assigned by
- redhat
Description
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.
Timeline
ID reserved
By redhat
- 22 days later
· 22 days later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | Medium4.9 | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L |
| NVDNVD · Modified | 3.1 | Medium5.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
- EPSS (exploitation in 30 days)
- 0.33% · top 74% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.9.
Weakness
Affected products
Red Hat · Red Hat Enterprise Linux 8
- unaffected 8100020240314161907.e155f54d – < *
Red Hat · Red Hat Enterprise Linux 8
- unaffected 8100020240314161907.e155f54d – < *
Red Hat · Red Hat Enterprise Linux 9
- unaffected 17:9.0.0-10.el9_5.3 – < *
Red Hat · Red Hat Enterprise Linux 6
All versions: unknown
Red Hat · Red Hat Enterprise Linux 7
All versions: unknown
Red Hat · Red Hat Enterprise Linux 7
All versions: unknown
Red Hat · Red Hat Enterprise Linux 8 Advanced Virtualization
All versions: affected
What to do
Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
References (7)
- RHSA-2024:2962 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2025:4492 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2023-6693 (opens in a new tab)vdb-entryx_refsource_REDHATx_transferred
- RHBZ#2254580 (opens in a new tab)issue-trackingx_refsource_REDHATx_transferred
- https://lists.fedoraproject.org/archives/list/[email protected]/message/OYGUN5HVOXESW7MSNM44E4AE2VNXQB6Y/ (opens in a new tab)x_transferred
- https://security.netapp.com/advisory/ntap-20240208-0004/ (opens in a new tab)x_transferred
- https://lists.debian.org/debian-lts-announce/2025/04/msg00042.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-6693)Record last updated .