HOMEVULNERABILITIESCVE-2023-6693
MEDIUM

CVE-2023-6693

CWE-121Published: January 2, 2024· Updated: Jun 17, 2026

5.3
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2023-6693 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Affected Vendors & Products

Fedora1 product(s)
fedora
qemu1 product(s)
qemu
Red Hat1 product(s)
enterprise linux
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=2254580
PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=2254580
ADVISORYhttps://access.redhat.com/security/cve/CVE-2023-6693
ADVISORYhttps://access.redhat.com/security/cve/CVE-2023-6693

All References (10)

→
https://access.redhat.com/errata/RHSA-2024:2962
→
https://access.redhat.com/errata/RHSA-2025:4492
→
https://access.redhat.com/security/cve/CVE-2023-6693Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2254580Issue Tracking · Patch
→
https://access.redhat.com/errata/RHSA-2024:2962
→
https://access.redhat.com/security/cve/CVE-2023-6693Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2254580Issue Tracking · Patch
→
https://lists.debian.org/debian-lts-announce/2025/04/msg00042.html
→
https://lists.fedoraproject.org/archives/list/[email protected]/message/OYGUN5HVOXESW7MSNM44E4AE2VNXQB6Y/
→
https://security.netapp.com/advisory/ntap-20240208-0004/

Quick Facts

CVE IDCVE-2023-6693
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-121
CISA KEVNo
Affected3 vendor(s)
PublishedJan 2, 2024

Related CVEs (CWE-121)

CVE-2012-10058
10.0
CVE-2026-42996
10.0
CVE-2026-37541
10.0
CVE-2017-20230
10.0
CVE-2026-12847
10.0
CVE-2023-3943
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-6693 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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