CVE-2026-33999
Published: Apr 23, 2026
Modified: Jun 5, 2026
CVSS v3.1
7.8
Description
A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.
| Vendor | Product | Versions |
|---|---|---|
Red Hat | Red Hat Enterprise Linux 10 | unaffected 0:24.1.5-6.el10_1 - < * |
Red Hat | Red Hat Enterprise Linux 10 | unaffected 0:24.1.9-4.el10_2 - < * |
Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | unaffected 0:24.1.5-6.el10_0 - < * |
Red Hat | Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION | unaffected 0:1.1.0-25.el6_10.16 - < * |
Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | unaffected 0:1.20.4-34.el7_9 - < * |
Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | unaffected 0:1.8.0-36.el7_9.4 - < * |
Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:21.1.3-20.el8_10 - < * |
Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:1.20.11-28.el8_10 - < * |
Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:1.15.0-9.el8_10 - < * |
Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | unaffected 0:1.20.10-4.el8_4 - < * |
Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | unaffected 0:1.11.0-8.el8_4.15 - < * |
Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | unaffected 0:1.20.10-4.el8_4 - < * |
Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | unaffected 0:1.11.0-8.el8_4.15 - < * |
Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | unaffected 0:21.1.3-2.el8_6.6 - < * |
Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | unaffected 0:1.20.11-7.el8_6 - < * |
Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | unaffected 0:21.1.3-2.el8_6.6 - < * |
Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | unaffected 0:1.20.11-7.el8_6 - < * |
Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | unaffected 0:21.1.3-2.el8_6.6 - < * |
Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | unaffected 0:1.20.11-7.el8_6 - < * |
Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | unaffected 0:21.1.3-13.el8_8 - < * |
Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | unaffected 0:1.20.11-18.el8_8 - < * |
Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | unaffected 0:1.12.0-15.el8_8.17 - < * |
Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | unaffected 0:21.1.3-13.el8_8 - < * |
Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | unaffected 0:1.20.11-18.el8_8 - < * |
Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | unaffected 0:1.12.0-15.el8_8.17 - < * |
Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:1.15.0-6.el9_7.1 - < * |
Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:23.2.7-6.el9_7 - < * |
Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:1.20.11-33.el9_7 - < * |
Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:1.15.0-7.el9_8.1 - < * |
Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:1.20.11-34.el9_8 - < * |
Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:24.1.9-4.el9_8 - < * |
Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | unaffected 0:21.1.3-5.el9_0 - < * |
Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | unaffected 0:1.20.11-13.el9_0 - < * |
Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | unaffected 0:1.11.0-22.el9_0.17 - < * |
Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | unaffected 0:21.1.3-10.el9_2 - < * |
Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | unaffected 0:1.20.11-20.el9_2 - < * |
Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | unaffected 0:1.12.0-14.el9_2.14 - < * |
Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | unaffected 0:1.20.11-28.el9_4 - < * |
Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | unaffected 0:22.1.9-8.el9_4 - < * |
Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | unaffected 0:1.13.1-8.el9_4.9 - < * |
Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | unaffected 0:1.20.11-33.el9_6 - < * |
Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | unaffected 0:23.2.7-6.el9_6 - < * |
Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | unaffected 0:1.14.1-10.el9_6 - < * |
Red Hat | Red Hat Enterprise Linux 6 | All versions |
Weaknesses (CWE)
CVSS v3.1 Details
CVSS v3.1 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
References
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