Xorg-x11-server: heap buffer overflow in devicefocusevent and procxiquerypointer
Priority MEDIUM 46CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 23 fixed, 1 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.
Summary
A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap overflow if a bigger value was used.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02106 81st percentileScored 2026-11-07
Fix Partial Red Hat: 15 advisoriesRed Hat: 23 fixed, 1 without a fix
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION | — | 1.1.0-25.el6_10.13 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 7 | — | 1.20.4-27.el7_9 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 7 | — | 1.8.0-31.el7_9 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | 1.13.1-2.el8_9.7 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | 1.20.11-22.el8 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | 21.1.3-15.el8 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.2 Advanced Update Support | — | 1.9.0-15.el8_2.9 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.2 Telecommunications Update Service | — | 1.9.0-15.el8_2.9 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions | — | 1.9.0-15.el8_2.9 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | — | 1.11.0-8.el8_4.8 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.4 Telecommunications Update Service | — | 1.11.0-8.el8_4.8 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions | — | 1.11.0-8.el8_4.8 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support | — | 1.12.0-6.el8_6.9 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.8 Extended Update Support | — | 1.12.0-15.el8_8.7 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | 1.13.1-3.el9_3.6 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | 1.20.11-24.el9 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | 22.1.9-5.el9 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9.0 Extended Update Support | — | 1.11.0-22.el9_0.8 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9.2 Extended Update Support | — | 1.12.0-14.el9_2.5 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | No fix listed | CNA |
- Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION VendorRed Hat Affected — Fixed in 1.1.0-25.el6_10.13 Patch available CNA
- Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in 1.20.4-27.el7_9 Patch available CNA
- Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in 1.8.0-31.el7_9 Patch available CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 1.13.1-2.el8_9.7 Patch available CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 1.20.11-22.el8 Patch available CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 21.1.3-15.el8 Patch available CNA
- Red Hat Enterprise Linux 8.2 Advanced Update Support VendorRed Hat Affected — Fixed in 1.9.0-15.el8_2.9 Patch available CNA
- Red Hat Enterprise Linux 8.2 Telecommunications Update Service VendorRed Hat Affected — Fixed in 1.9.0-15.el8_2.9 Patch available CNA
- Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions VendorRed Hat Affected — Fixed in 1.9.0-15.el8_2.9 Patch available CNA
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support VendorRed Hat Affected — Fixed in 1.11.0-8.el8_4.8 Patch available CNA
- Red Hat Enterprise Linux 8.4 Telecommunications Update Service VendorRed Hat Affected — Fixed in 1.11.0-8.el8_4.8 Patch available CNA
- Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions VendorRed Hat Affected — Fixed in 1.11.0-8.el8_4.8 Patch available CNA
- Red Hat Enterprise Linux 8.6 Extended Update Support VendorRed Hat Affected — Fixed in 1.12.0-6.el8_6.9 Patch available CNA
- Red Hat Enterprise Linux 8.8 Extended Update Support VendorRed Hat Affected — Fixed in 1.12.0-15.el8_8.7 Patch available CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 1.13.1-3.el9_3.6 Patch available CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 1.20.11-24.el9 Patch available CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 22.1.9-5.el9 Patch available CNA
- Red Hat Enterprise Linux 9.0 Extended Update Support VendorRed Hat Affected — Fixed in 1.11.0-22.el9_0.8 Patch available CNA
- Red Hat Enterprise Linux 9.2 Extended Update Support VendorRed Hat Affected — Fixed in 1.12.0-14.el9_2.5 Patch available CNA
- Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — No fix listed CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:* | before 21.1.11 | Vulnerable | x.org |
| cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:* | before 23.2.4 | Vulnerable | x.org |
| cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* | 39 | Vulnerable | Fedoraproject |
| cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Red Hat |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
- cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:* Versions before 21.1.11 Vulnerable ·x.org
- cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:* Versions before 23.2.4 Vulnerable ·x.org
- cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* Versions 39 Vulnerable ·Fedoraproject
- cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
Remediation
Red Hat 15 advisories
- RHSA-2025:12751 Released 2025-08-04 · Red Hat rating Importanttigervnc security update
- Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION) tigervnc-1.1.0-25.el6_10.13, tigervnc-server-1.1.0-25.el6_10.13
- Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION) tigervnc-server-applet-1.1.0-25.el6_10.13, tigervnc-server-module-1.1.0-25.el6_10.13
- RHSA-2024:2996 Released 2024-05-22 · Red Hat rating Moderatexorg-x11-server-Xwayland security update
- Red Hat Enterprise Linux AppStream (v. 8) xorg-x11-server-Xwayland-21.1.3-15.el8
- RHSA-2024:2995 Released 2024-05-22 · Red Hat rating Moderatexorg-x11-server security update
- Red Hat Enterprise Linux AppStream (v. 8) xorg-x11-server-1.20.11-22.el8, xorg-x11-server-Xdmx-1.20.11-22.el8, xorg-x11-server-Xephyr-1.20.11-22.el8 +4
- Red Hat Enterprise Linux CRB (v. 8) xorg-x11-server-devel-1.20.11-22.el8, xorg-x11-server-source-1.20.11-22.el8
Show 12 more Red Hat advisories
- RHSA-2024:2169 Released 2024-04-30 · Red Hat rating Moderatexorg-x11-server security update
- Red Hat Enterprise Linux AppStream (v. 9) xorg-x11-server-1.20.11-24.el9, xorg-x11-server-Xdmx-1.20.11-24.el9, xorg-x11-server-Xephyr-1.20.11-24.el9 +4
- Red Hat Enterprise Linux CRB (v. 9) xorg-x11-server-devel-1.20.11-24.el9, xorg-x11-server-source-1.20.11-24.el9
- RHSA-2024:2170 Released 2024-04-30 · Red Hat rating Moderatexorg-x11-server-Xwayland security update
- Red Hat Enterprise Linux AppStream (v. 9) xorg-x11-server-Xwayland-22.1.9-5.el9
- RHSA-2024:0629 Released 2024-01-31 · Red Hat rating Importanttigervnc security update
- Red Hat Enterprise Linux Client (v. 7) tigervnc-1.8.0-31.el7_9, tigervnc-icons-1.8.0-31.el7_9, tigervnc-license-1.8.0-31.el7_9 +2
- Red Hat Enterprise Linux Client Optional (v. 7) tigervnc-server-applet-1.8.0-31.el7_9, tigervnc-server-module-1.8.0-31.el7_9
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) tigervnc-1.8.0-31.el7_9, tigervnc-icons-1.8.0-31.el7_9, tigervnc-server-1.8.0-31.el7_9 +2
- Red Hat Enterprise Linux Server (v. 7) tigervnc-1.8.0-31.el7_9, tigervnc-icons-1.8.0-31.el7_9, tigervnc-license-1.8.0-31.el7_9 +2
- Red Hat Enterprise Linux Server Optional (v. 7) tigervnc-server-applet-1.8.0-31.el7_9, tigervnc-server-module-1.8.0-31.el7_9
- Red Hat Enterprise Linux Workstation (v. 7) tigervnc-1.8.0-31.el7_9, tigervnc-icons-1.8.0-31.el7_9, tigervnc-license-1.8.0-31.el7_9 +2
- Red Hat Enterprise Linux Workstation Optional (v. 7) tigervnc-server-applet-1.8.0-31.el7_9, tigervnc-server-module-1.8.0-31.el7_9
- RHSA-2024:0626 Released 2024-01-31 · Red Hat rating Importanttigervnc security update
- Red Hat Enterprise Linux AppStream EUS (v.9.2) tigervnc-1.12.0-14.el9_2.5, tigervnc-icons-1.12.0-14.el9_2.5, tigervnc-license-1.12.0-14.el9_2.5 +4
- RHSA-2024:0617 Released 2024-01-31 · Red Hat rating Importanttigervnc security update
- Red Hat Enterprise Linux AppStream AUS (v. 8.2) tigervnc-1.9.0-15.el8_2.9, tigervnc-icons-1.9.0-15.el8_2.9, tigervnc-license-1.9.0-15.el8_2.9 +4
- Red Hat Enterprise Linux AppStream E4S (v. 8.2) tigervnc-1.9.0-15.el8_2.9, tigervnc-icons-1.9.0-15.el8_2.9, tigervnc-license-1.9.0-15.el8_2.9 +4
- Red Hat Enterprise Linux AppStream TUS (v. 8.2) tigervnc-1.9.0-15.el8_2.9, tigervnc-icons-1.9.0-15.el8_2.9, tigervnc-license-1.9.0-15.el8_2.9 +4
- RHSA-2024:0621 Released 2024-01-30 · Red Hat rating Importanttigervnc security update
- Red Hat Enterprise Linux AppStream EUS (v.8.6) tigervnc-1.12.0-6.el8_6.9, tigervnc-icons-1.12.0-6.el8_6.9, tigervnc-license-1.12.0-6.el8_6.9 +4
- RHSA-2024:0614 Released 2024-01-30 · Red Hat rating Importanttigervnc security update
- Red Hat Enterprise Linux AppStream EUS (v.9.0) tigervnc-1.11.0-22.el9_0.8, tigervnc-icons-1.11.0-22.el9_0.8, tigervnc-license-1.11.0-22.el9_0.8 +4
- RHSA-2024:0607 Released 2024-01-30 · Red Hat rating Importanttigervnc security update
- Red Hat Enterprise Linux AppStream (v. 8) tigervnc-1.13.1-2.el8_9.7, tigervnc-icons-1.13.1-2.el8_9.7, tigervnc-license-1.13.1-2.el8_9.7 +4
- RHSA-2024:0597 Released 2024-01-30 · Red Hat rating Importanttigervnc security update
- Red Hat Enterprise Linux AppStream EUS (v.8.8) tigervnc-1.12.0-15.el8_8.7, tigervnc-icons-1.12.0-15.el8_8.7, tigervnc-license-1.12.0-15.el8_8.7 +4
- RHSA-2024:0558 Released 2024-01-30 · Red Hat rating Importanttigervnc security update
- Red Hat Enterprise Linux AppStream AUS (v.8.4) tigervnc-1.11.0-8.el8_4.8, tigervnc-icons-1.11.0-8.el8_4.8, tigervnc-license-1.11.0-8.el8_4.8 +4
- Red Hat Enterprise Linux AppStream E4S (v.8.4) tigervnc-1.11.0-8.el8_4.8, tigervnc-icons-1.11.0-8.el8_4.8, tigervnc-license-1.11.0-8.el8_4.8 +4
- Red Hat Enterprise Linux AppStream TUS (v.8.4) tigervnc-1.11.0-8.el8_4.8, tigervnc-icons-1.11.0-8.el8_4.8, tigervnc-license-1.11.0-8.el8_4.8 +4
- RHSA-2024:0557 Released 2024-01-30 · Red Hat rating Importanttigervnc security update
- Red Hat Enterprise Linux AppStream (v. 9) tigervnc-1.13.1-3.el9_3.6, tigervnc-icons-1.13.1-3.el9_3.6, tigervnc-license-1.13.1-3.el9_3.6 +4
- RHSA-2024:0320 Released 2024-01-22 · Red Hat rating Importantxorg-x11-server security update
- Red Hat Enterprise Linux Client (v. 7) xorg-x11-server-1.20.4-27.el7_9, xorg-x11-server-Xephyr-1.20.4-27.el7_9, xorg-x11-server-Xorg-1.20.4-27.el7_9 +1
- Red Hat Enterprise Linux Client Optional (v. 7) xorg-x11-server-Xdmx-1.20.4-27.el7_9, xorg-x11-server-Xnest-1.20.4-27.el7_9, xorg-x11-server-Xvfb-1.20.4-27.el7_9 +3
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) xorg-x11-server-1.20.4-27.el7_9, xorg-x11-server-Xdmx-1.20.4-27.el7_9, xorg-x11-server-Xephyr-1.20.4-27.el7_9 +7
- Red Hat Enterprise Linux Server (v. 7) xorg-x11-server-1.20.4-27.el7_9, xorg-x11-server-Xephyr-1.20.4-27.el7_9, xorg-x11-server-Xorg-1.20.4-27.el7_9 +1
- Red Hat Enterprise Linux Server Optional (v. 7) xorg-x11-server-Xdmx-1.20.4-27.el7_9, xorg-x11-server-Xnest-1.20.4-27.el7_9, xorg-x11-server-Xvfb-1.20.4-27.el7_9 +4
- Red Hat Enterprise Linux Workstation (v. 7) xorg-x11-server-1.20.4-27.el7_9, xorg-x11-server-Xephyr-1.20.4-27.el7_9, xorg-x11-server-Xorg-1.20.4-27.el7_9 +1
- Red Hat Enterprise Linux Workstation Optional (v. 7) xorg-x11-server-Xdmx-1.20.4-27.el7_9, xorg-x11-server-Xnest-1.20.4-27.el7_9, xorg-x11-server-Xvfb-1.20.4-27.el7_9 +3
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2024:0607, RHSA-2024:2995, RHSA-2024:2996 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2024:0557, RHSA-2024:2169, RHSA-2024:2170 |
| Red Hat Enterprise Linux AppStream AUS (v. 8.2) | Fixed | RHSA-2024:0617 |
| Red Hat Enterprise Linux AppStream AUS (v.8.4) | Fixed | RHSA-2024:0558 |
| Red Hat Enterprise Linux AppStream E4S (v. 8.2) | Fixed | RHSA-2024:0617 |
| Red Hat Enterprise Linux AppStream E4S (v.8.4) | Fixed | RHSA-2024:0558 |
| Red Hat Enterprise Linux AppStream EUS (v.8.6) | Fixed | RHSA-2024:0621 |
| Red Hat Enterprise Linux AppStream EUS (v.8.8) | Fixed | RHSA-2024:0597 |
| Red Hat Enterprise Linux AppStream EUS (v.9.0) | Fixed | RHSA-2024:0614 |
| Red Hat Enterprise Linux AppStream EUS (v.9.2) | Fixed | RHSA-2024:0626 |
| Red Hat Enterprise Linux AppStream TUS (v. 8.2) | Fixed | RHSA-2024:0617 |
| Red Hat Enterprise Linux AppStream TUS (v.8.4) | Fixed | RHSA-2024:0558 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2024:2995 |
| Red Hat Enterprise Linux CRB (v. 9) | Fixed | RHSA-2024:2169 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2024:0320, RHSA-2024:0629 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2024:0320, RHSA-2024:0629 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2024:0320, RHSA-2024:0629 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2024:0320, RHSA-2024:0629 |
| Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION) | Fixed | RHSA-2025:12751 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2024:0320, RHSA-2024:0629 |
| Red Hat Enterprise Linux Server Optional -EXTENSION (v. 6 ELS -EXTENSION) | Fixed | RHSA-2025:12751 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2024:0320, RHSA-2024:0629 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2024:0320, RHSA-2024:0629 |
Timeline
- 2026-10-02 Threatist record created from CVE-2023-6816
- 2026-10-03 Alias added: GHSA-pcjv-393q-rqf2
References
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Sources
- CVE-2023-6816 · CVE Program
- CVE-2023-6816 · NVD
- FIRST EPSS
- GHSA-pcjv-393q-rqf2 · GitHub Advisory Database · CC BY 4.0
- CVE-2023-6816 · Red Hat security data · CC BY 4.0
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