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NVD / CVE Program· CNA redhat

CVE-2023-6693: Qemu: virtio-net: stack buffer overflow in virtio_net_flush_tx()

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.33% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: qemu (Debian:11) 1:5.2+dfsg-11+deb11u4; qemu (Debian:12) 1:7.2+dfsg-7+deb12u4; qemu (Debian:13) 1:8.2.0+ds-3.

Low priority for now. Upgrade to qemu (Debian:11) 1:5.2+dfsg-11+deb11u4; qemu (Debian:12) 1:7.2+dfsg-7+deb12u4; qemu (Debian:13) 1:8.2.0+ds-3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
Jan 2, 2024
Updated
Jun 17, 2026
EPSS
0.3% · 26th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.3
CNA · redhat
4.9
0.4 point gap

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
qemuqemu
redhatenterprise linux
fedoraprojectfedora

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • fedoraproject fedora39
  • qemu qemubefore 8.2.1
  • redhat enterprise linux8.0
  • redhat enterprise linux9.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown
    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 8

    • 8100020240314161907.e155f54d and laternot affected · rpm
    • 8100020240314161907.e155f54d and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8 Advanced Virtualization

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 9

    • 17:9.0.0-10.el9_5.3 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:11qemubefore 1:5.2+dfsg-11+deb11u41:5.2+dfsg-11+deb11u4
Debian:12qemubefore 1:7.2+dfsg-7+deb12u41:7.2+dfsg-7+deb12u4
Debian:13qemubefore 1:8.2.0+ds-31:8.2.0+ds-3
openSUSE:Leap 15.5qemubefore 7.1.0-150500.49.12.17.1.0-150500.49.12.1
openSUSE:Tumbleweedqemubefore 8.2.1-1.18.2.1-1.1
Red Hat:enterprise_linux:8::appstreamhivexbefore 0:1.3.18-23.module+el8.9.0+18724+20190c230:1.3.18-23.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamhivex-debuginfobefore 0:1.3.18-23.module+el8.9.0+18724+20190c230:1.3.18-23.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamhivex-debugsourcebefore 0:1.3.18-23.module+el8.9.0+18724+20190c230:1.3.18-23.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamhivex-develbefore 0:1.3.18-23.module+el8.9.0+18724+20190c230:1.3.18-23.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfsbefore 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfs-appliancebefore 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfs-bash-completionbefore 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfs-debuginfobefore 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfs-debugsourcebefore 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfs-develbefore 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfs-gfs2before 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfs-gobjectbefore 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfs-gobject-debuginfobefore 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfs-gobject-develbefore 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfs-inspect-iconsbefore 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfs-javabefore 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfs-java-debuginfobefore 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfs-java-develbefore 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23
Red Hat:enterprise_linux:8::appstreamlibguestfs-javadocbefore 1:1.44.0-9.module+el8.9.0+18724+20190c231:1.44.0-9.module+el8.9.0+18724+20190c23

+96

Same product

qemu: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-12928The QMP migrate command in QEMU version 4.0.0 and earlier is vulnerable to OS command injection, which allows the remote attacker to achieve
    60This week
  • CVE-2015-8556Local privilege escalation vulnerability in the Gentoo QEMU package before 2.5.0-r1.
    44Plan
  • CVE-2017-15118A stack-based buffer overflow vulnerability was found in NBD server implementation in qemu before 2.11 allowing a client to request an expor
    43Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-5088Nov 3, 2023 · Qemu: improper ide controller reset can lead to mbr overwrite
    28Monitor
  • ← EarlierCVE-2023-2861Dec 6, 2023 · Qemu: 9pfs: improper access control on special files
    28Monitor
  • Later →CVE-2023-6683Jan 12, 2024 · Qemu: vnc: null pointer dereference in qemu_clipboard_request()
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:qemu1:7.2+dfsg-7+deb12u4 · Debian:12Package registry (OSV)
opensuse:qemu7.1.0-150500.49.12.1 · openSUSE:Leap 15.5Package registry (OSV)
red hat:hivex0:1.3.18-23.module+el8.9.0+18724+20190c23 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:hivex-debuginfo0:1.3.18-23.module+el8.9.0+18724+20190c23 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:hivex-debugsource0:1.3.18-23.module+el8.9.0+18724+20190c23 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:hivex-devel0:1.3.18-23.module+el8.9.0+18724+20190c23 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libguestfs1:1.44.0-9.module+el8.9.0+18724+20190c23 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libguestfs-appliance1:1.44.0-9.module+el8.9.0+18724+20190c23 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libguestfs-bash-completion1:1.44.0-9.module+el8.9.0+18724+20190c23 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libguestfs-debuginfo1:1.44.0-9.module+el8.9.0+18724+20190c23 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libguestfs-debugsource1:1.44.0-9.module+el8.9.0+18724+20190c23 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libguestfs-devel1:1.44.0-9.module+el8.9.0+18724+20190c23 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libguestfs-gfs21:1.44.0-9.module+el8.9.0+18724+20190c23 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:SLOF0:20210217-2.module+el8.10.0+20141+6faa2812 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
rocky linux:hivex0:1.3.18-23.module+el8.10.0+1590+a67ab969 · Rocky Linux:8Package registry (OSV)
rocky linux:libguestfs1:1.44.0-9.module+el8.10.0+1590+a67ab969.rocky · Rocky Linux:8Package registry (OSV)
rocky linux:libguestfs-winsupport0:8.10-1.module+el8.10.0+1451+358d0d76 · Rocky Linux:8Package registry (OSV)
rocky linux:libiscsi0:1.18.0-8.module+el8.10.0+1590+a67ab969 · Rocky Linux:8Package registry (OSV)
rocky linux:libnbd0:1.6.0-5.module+el8.10.0+1590+a67ab969 · Rocky Linux:8Package registry (OSV)
rocky linux:libtpms0:0.9.1-2.20211126git1ff6fe1f43.module+el8.10.0+1590+a67ab969 · Rocky Linux:8Package registry (OSV)
rocky linux:libvirt0:8.0.0-23.1.module+el8.10.0+1779+84732956 · Rocky Linux:8Package registry (OSV)
rocky linux:libvirt-dbus0:1.3.0-2.module+el8.10.0+1590+a67ab969 · Rocky Linux:8Package registry (OSV)
rocky linux:libvirt-python0:8.0.0-2.module+el8.10.0+1590+a67ab969 · Rocky Linux:8Package registry (OSV)
rocky linux:nbdkit0:1.24.0-5.module+el8.10.0+1590+a67ab969 · Rocky Linux:8Package registry (OSV)
rocky linux:netcf0:0.2.8-12.module+el8.10.0+1590+a67ab969 · Rocky Linux:8Package registry (OSV)
rocky linux:perl-Sys-Virt0:8.0.0-1.module+el8.10.0+1590+a67ab969 · Rocky Linux:8Package registry (OSV)
suse:qemu7.1.0-150500.49.12.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2023-0330302 days apartQemu: lsi53c895a: dma reentrancy issue leads to stack overflow
    24Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
low · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
Low
Availability impact
Low

Weakness class (CWE)

CWE-121 · Stack-based Buffer Overflow

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records