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CVE-2023-6693

19
FAUCET Score

CVE-2023-6693 describes a stack-based buffer overflow in the virtio-net device of QEMU, affecting various Fedora and Red Hat Enterprise Linux QEMU packages. This vulnerability, triggered when specific guest features are enabled during TX flushing, allows a local, low-privileged attacker to overwrite stack variables. The potential impact is an information leak, specifically the reading of process memory, and has a CVSS score of 5.3 (Medium). There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 8.2.1CPE matchmatch criteria
cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:-:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
39CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.9MEDIUM

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 Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
1.4
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.33%
Probability of exploitation in next 30 days
EPSS Percentile
25.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0033 is in the 82nd percentile among its peer group of 15,940 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (14)

microsoftpatch availablevia msrc
Product: azl3 qemu 8.2.0-13 on Azure Linux 3.0Fixed in: 8.2.0-13
microsoftpatch availablevia msrc
Product: 17459-17084Fixed in: 8.2.0-13
microsoftpatch availablevia msrc
Product: 18122-17084Fixed in: 8.2.0-13
microsoftpatch availablevia msrc
Product: cbl2 qemu 6.2.0-24 on CBL Mariner 2.0Fixed in: 6.2.0-21
microsoftpatch availablevia msrc
Product: cbl2 qemu 6.2.0-21 on CBL Mariner 2.0Fixed in: 6.2.0-21
microsoftpatch availablevia msrc
Product: azl3 qemu 8.2.0-16 on Azure Linux 3.0Fixed in: 8.2.0-13
microsoftpatch availablevia msrc
Product: 19662-17086Fixed in: 6.2.0-21
microsoftpatch availablevia msrc
Product: 18121-16823Fixed in: 6.2.0-21
microsoftpatch availablevia msrc
Product: 17093-17086Fixed in: 6.2.0-21
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: virt-devel:rhel-8100020240314161907.e155f54d
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: virt:rhel-8100020240314161907.e155f54d
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: qemu-kvm-17:9.0.0-10.el9_5.3
View patch
redhatpatch availablevia nvd_reference
View patch
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 8 Advanced VirtualizationFixed in: virt:av/qemu-kvm

Vendor Advisories (2)

microsoft2024-Jan/CVE-2023-6693

Qemu: virtio-net: stack buffer overflow in virtio_net_flush_tx()

Jan 9, 2024
redhatCVE-2023-6693Moderate

QEMU: virtio-net: stack buffer overflow in virtio_net_flush_tx()

Jan 2, 2024

References

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