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TI-2023-06113 Aliases CVE-2023-6683GHSA-x9c6-9g9w-hg73

Qemu: vnc: null pointer dereference in qemu_clipboard_request()

Priority LOW 31CWE-476Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-476.

Summary

A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. The qemu_clipboard_request() function can be reached before vnc_server_cut_text_caps() was called and had the chance to initialize the clipboard peer, leading to a NULL pointer dereference. This could allow a malicious authenticated VNC client to crash QEMU and trigger a denial of service.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01261 69th percentileScored 2026-11-07
Fix Fixed Red Hat: 2 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat Enterprise Linux 8—8100020240314161907.e155f54dPatch availableCNA
Red HatRed Hat Enterprise Linux 8—8100020240314161907.e155f54dPatch availableCNA
Red HatRed Hat Enterprise Linux 9—17:8.2.0-11.el9_4Patch availableCNA
Red HatRed Hat Enterprise Linux 6——Not affectedCNA
Red HatRed Hat Enterprise Linux 7——Not affectedCNA
Red HatRed Hat Enterprise Linux 7——Not affectedCNA
Red HatRed Hat Enterprise Linux 8 Advanced Virtualization——Not affectedCNA
  • Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 8100020240314161907.e155f54d Patch available CNA
  • Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 8100020240314161907.e155f54d Patch available CNA
  • Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 17:8.2.0-11.el9_4 Patch available CNA
  • Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Enterprise Linux 8 Advanced Virtualization VendorRed Hat Affected — Fixed in — Not affected CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*6.1.0 to before 8.2.2VulnerableQEMU
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*9.0VulnerableRed Hat
  • cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* Versions 6.1.0 to before 8.2.2 Vulnerable ·QEMU
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat

Remediation

Red Hat 2 advisories

  • RHSA-2024:2962 Released 2024-05-22 · Red Hat rating Moderate
    virt:rhel and virt-devel:rhel security and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) SLOF-20210217-2.module+el8.10.0+20141+6faa2812.noarch::virt:rhel, SLOF-20210217-2.module+el8.10.0+20141+6faa2812.src::virt:rhel, hivex-1.3.18-23.module+el8.9.0+18724+20190c23.aarch64::virt:rhel +47
    • Red Hat Enterprise Linux CRB (v. 8) SLOF-20210217-2.module+el8.10.0+20141+6faa2812.src::virt-devel:rhel, hivex-1.3.18-23.module+el8.9.0+18724+20190c23.i686::virt-devel:rhel, hivex-devel-1.3.18-23.module+el8.9.0+18724+20190c23.i686::virt-devel:rhel +47
  • RHSA-2024:2135 Released 2024-04-30 · Red Hat rating Moderate
    qemu-kvm security update
    • Red Hat Enterprise Linux AppStream (v. 9) qemu-guest-agent-17:8.2.0-11.el9_4, qemu-img-17:8.2.0-11.el9_4, qemu-kvm-17:8.2.0-11.el9_4 +17

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2024:2962
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2024:2135
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2024:2962
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8 Advanced Virtualization

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-6683
  2. 2026-10-03 Alias added: GHSA-x9c6-9g9w-hg73

References

Patch 1

Advisory 4

  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-10530 Code injection in [UNKNOWN] RichFaces KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-23530 Sudo before 1.9.17p1 allows local users to obtain root access because /etc/nsswitch.conf… KEVCVSS 3.1CRITICAL 9.3
  • TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0
See all 1955 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences