xorg-x11-server: DeepCopyPointerClasses use-after-free leads to privilege elevation
Published Mar 27, 2023
7.8
HIGHCVSS 3.1
EPSS 0.90%
Description
A vulnerability was found in X.Org. This issue occurs due to a dangling pointer in DeepCopyPointerClasses that can be exploited by ProcXkbSetDeviceInfo() and ProcXkbGetDeviceInfo() to read and write into freed memory. This can lead to local privilege elevation on systems where the X server runs privileged and remote code execution for ssh X forwarding sessions.
Affected products
- Vendor n/a Product Xorg-X11-Server Defaultn/a
- Version xorg-server 21.1.7StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Xorg-X11-Server | n/a |
|
Configuration 2
- 36
- 37
Configuration 3
- 8.0
- 8.1
- 9.0
- 8.4
- 8.6
- 7.0
- 8.4
- 8.6
- 9.0
- 7.0
- 8.0
- 8.4
- 8.6
- 7.0
- 7.0
- 8.0
- 9.0
- 8.4
- 8.6
- 7.0
- 7.0
- 8.2
- 8.1
- 8.2
- 8.4
- 8.6
- 9.0
- 8.2
- 8.4
- 8.6
- 8.2
- 7.0
No data.
Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION
tigervnc-0:1.1.0-25.el6_10.13
Fixed · RHSA-2025:12751
Red Hat Enterprise Linux 7
tigervnc-0:1.8.0-24.el7_9
Fixed · RHSA-2023:0675
Red Hat Enterprise Linux 7
xorg-x11-server-0:1.20.4-22.el7_9
Fixed · RHSA-2023:0675
Red Hat Enterprise Linux 8
tigervnc-0:1.12.0-9.el8_7.1
Fixed · RHSA-2023:0662
Red Hat Enterprise Linux 8
xorg-x11-server-0:1.20.11-15.el8
Fixed · RHSA-2023:2806
Red Hat Enterprise Linux 8
xorg-x11-server-Xwayland-0:21.1.3-10.el8
Fixed · RHSA-2023:2805
Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions
tigervnc-0:1.9.0-16.el8_1.1
Fixed · RHSA-2023:0665
Red Hat Enterprise Linux 8.2 Advanced Update Support
tigervnc-0:1.9.0-15.el8_2.1
Fixed · RHSA-2023:0671
Red Hat Enterprise Linux 8.2 Telecommunications Update Service
tigervnc-0:1.9.0-15.el8_2.1
Fixed · RHSA-2023:0671
Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions
tigervnc-0:1.9.0-15.el8_2.1
Fixed · RHSA-2023:0671
Red Hat Enterprise Linux 8.4 Extended Update Support
tigervnc-0:1.11.0-8.el8_4.1
Fixed · RHSA-2023:0664
Red Hat Enterprise Linux 8.6 Extended Update Support
tigervnc-0:1.12.0-6.el8_6.1
Fixed · RHSA-2023:0663
Red Hat Enterprise Linux 9
tigervnc-0:1.12.0-5.el9_1.1
Fixed · RHSA-2023:0622
Red Hat Enterprise Linux 9
xorg-x11-server-0:1.20.11-17.el9
Fixed · RHSA-2023:2248
Red Hat Enterprise Linux 9
xorg-x11-server-Xwayland-0:21.1.3-7.el9
Fixed · RHSA-2023:2249
Red Hat Enterprise Linux 9.0 Extended Update Support
tigervnc-0:1.11.0-22.el9_0.1
Fixed · RHSA-2023:0623
Red Hat Enterprise Linux 6
xorg-x11-server
Out of support scope
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION | tigervnc-0:1.1.0-25.el6_10.13 | Fixed | RHSA-2025:12751 |
| Red Hat Enterprise Linux 7 | tigervnc-0:1.8.0-24.el7_9 | Fixed | RHSA-2023:0675 |
| Red Hat Enterprise Linux 7 | xorg-x11-server-0:1.20.4-22.el7_9 | Fixed | RHSA-2023:0675 |
| Red Hat Enterprise Linux 8 | tigervnc-0:1.12.0-9.el8_7.1 | Fixed | RHSA-2023:0662 |
| Red Hat Enterprise Linux 8 | xorg-x11-server-0:1.20.11-15.el8 | Fixed | RHSA-2023:2806 |
| Red Hat Enterprise Linux 8 | xorg-x11-server-Xwayland-0:21.1.3-10.el8 | Fixed | RHSA-2023:2805 |
| Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions | tigervnc-0:1.9.0-16.el8_1.1 | Fixed | RHSA-2023:0665 |
| Red Hat Enterprise Linux 8.2 Advanced Update Support | tigervnc-0:1.9.0-15.el8_2.1 | Fixed | RHSA-2023:0671 |
| Red Hat Enterprise Linux 8.2 Telecommunications Update Service | tigervnc-0:1.9.0-15.el8_2.1 | Fixed | RHSA-2023:0671 |
| Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions | tigervnc-0:1.9.0-15.el8_2.1 | Fixed | RHSA-2023:0671 |
| Red Hat Enterprise Linux 8.4 Extended Update Support | tigervnc-0:1.11.0-8.el8_4.1 | Fixed | RHSA-2023:0664 |
| Red Hat Enterprise Linux 8.6 Extended Update Support | tigervnc-0:1.12.0-6.el8_6.1 | Fixed | RHSA-2023:0663 |
| Red Hat Enterprise Linux 9 | tigervnc-0:1.12.0-5.el9_1.1 | Fixed | RHSA-2023:0622 |
| Red Hat Enterprise Linux 9 | xorg-x11-server-0:1.20.11-17.el9 | Fixed | RHSA-2023:2248 |
| Red Hat Enterprise Linux 9 | xorg-x11-server-Xwayland-0:21.1.3-7.el9 | Fixed | RHSA-2023:2249 |
| Red Hat Enterprise Linux 9.0 Extended Update Support | tigervnc-0:1.11.0-22.el9_0.1 | Fixed | RHSA-2023:0623 |
| Red Hat Enterprise Linux 6 | xorg-x11-server | Out of support scope | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Xorg server does not run with root privileges in Red Hat Enterprise Linux 8 and 9, therefore Red Hat Enterprise Linux 8 and 9 have been rated with Moderate severity.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Feb 24, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2023–2026- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.90% (0.00899) | 58.18th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.90% (0.00899) | 54.78th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.58% (0.00577) | 66.90th | v4 (v2025.03.14) |
| Dec 17, 2024 | 1.27% (0.01267) | 85.38th | v3 (v2023.03.01) |
| Dec 12, 2024 | 0.18% (0.00183) | 56.90th | v3 (v2023.03.01) |
| May 23, 2024 | 0.16% (0.00158) | 52.25th | v3 (v2023.03.01) |
| Apr 28, 2024 | 0.14% (0.00140) | 49.01th | v3 (v2023.03.01) |
| Apr 15, 2024 | 0.12% (0.00117) | 45.11th | v3 (v2023.03.01) |
| Jul 8, 2023 | 0.10% (0.00100) | 40.46th | v3 (v2023.03.01) |
| Apr 1, 2023 | 0.14% (0.00136) | 47.45th | v3 (v2023.03.01) |
| Mar 28, 2023 | 0.38% (0.00382) | 68.77th | v3 (v2023.03.01) |
References (8)
- https://access.redhat.com/security/cve/CVE-2023-0494 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2165995 Issue TrackingThird Party Advisory
- https://github.com/advisories/GHSA-5v6x-2hpj-c37x
- https://gitlab.freedesktop.org/xorg/xserver/-/commit/0ba6d8c37071131a49790243cdac55392ecf71ec Patch
- https://lists.x.org/archives/xorg-announce/2023-February/003320.html Mailing ListVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2023-0494
- https://security.gentoo.org/glsa/202305-30 vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2023-0494
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2023-0494 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2165995 | Issue TrackingThird Party Advisory | |
| https://github.com/advisories/GHSA-5v6x-2hpj-c37x | ||
| https://gitlab.freedesktop.org/xorg/xserver/-/commit/0ba6d8c37071131a49790243cdac55392ecf71ec | Patch | |
| https://lists.x.org/archives/xorg-announce/2023-February/003320.html | Mailing ListVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2023-0494 | ||
| https://security.gentoo.org/glsa/202305-30 | vendor-advisory | |
| https://www.cve.org/CVERecord?id=CVE-2023-0494 |
Change history (0)
No recorded changes yet.