CVE-2026-34002— Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling
Quick assessment
Affected
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
X.Org X Server是X.Org基金会的一款X Window系统显示服务器。 X.Org X server存在安全漏洞，该漏洞源于XKB修饰符映射处理存在越界读取，可能导致敏感信息泄露或服务器崩溃。
Affected Version Matrix 42
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | 0:24.1.5-6.el10_0< * |
unaffected |
| Red Hat | Red Hat Enterprise Linux 6 | any |
unknown |
| Red Hat | Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION | 0:1.1.0-25.el6_10.16< * |
unaffected |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | 0:1.20.4-34.el7_9< * |
unaffected |
0:1.8.0-36.el7_9.4< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8 | any |
affected |
any |
affected | ||
any |
affected | ||
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | 0:1.20.10-4.el8_4< * |
unaffected |
0:1.11.0-8.el8_4.15< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | 0:1.20.10-4.el8_4< * |
unaffected |
0:1.11.0-8.el8_4.15< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | 0:21.1.3-2.el8_6.6< * |
unaffected |
0:1.20.11-7.el8_6< * |
unaffected | ||
0:1.12.0-6.el8_6.17< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | 0:1.12.0-6.el8_6.17< * |
unaffected |
| Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | 0:21.1.3-2.el8_6.6< * |
unaffected |
0:1.20.11-7.el8_6< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | 0:21.1.3-2.el8_6.6< * |
unaffected |
0:1.20.11-7.el8_6< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | 0:21.1.3-13.el8_8< * |
unaffected |
0:1.20.11-18.el8_8< * |
unaffected | ||
0:1.12.0-15.el8_8.17< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | 0:21.1.3-13.el8_8< * |
unaffected |
0:1.20.11-18.el8_8< * |
unaffected | ||
0:1.12.0-15.el8_8.17< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 9 | any |
affected |
any |
affected | ||
any |
affected | ||
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | 0:21.1.3-5.el9_0< * |
unaffected |
0:1.20.11-13.el9_0< * |
unaffected | ||
0:1.11.0-22.el9_0.17< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | 0:21.1.3-10.el9_2< * |
unaffected |
0:1.20.11-20.el9_2< * |
unaffected | ||
0:1.12.0-14.el9_2.14< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | 0:1.20.11-28.el9_4< * |
unaffected |
0:22.1.9-8.el9_4< * |
unaffected | ||
0:1.13.1-8.el9_4.9< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | 0:1.20.11-33.el9_6< * |
unaffected |
0:23.2.7-6.el9_6< * |
unaffected | ||
0:1.14.1-10.el9_6< * |
unaffected |
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I. Basic Information for CVE-2026-34002
Vulnerability Information
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Vulnerability Title
Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用不正确的长度值访问缓冲区
Source: CVE Program / CVE List V5
Vulnerability Title
X.Org X Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
X.Org X Server是X.Org基金会的一款X Window系统显示服务器。 X.Org X server存在安全漏洞，该漏洞源于XKB修饰符映射处理存在越界读取，可能导致敏感信息泄露或服务器崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-34002
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
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Vendor Advisories for CVE-2026-34002 (12)
-
-
-
🔗 RHSA-2026:21718 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:23254 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:24341 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:20560 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:20558 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:20563 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:20561 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
-
🔗 RHSA-2026:20557 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:23496 - Security Advisory - Red Hat 客户门户网站 Read full article vendor-advisory x_refsource_REDHAT
Other References for CVE-2026-34002 (14)
Same Patch Batch · Red Hat · 2026-05-05 · 3 CVEs total
| CVE-2026-34000 | 6.1 MEDIUM | Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bo |
| CVE-2026-34956 | 5.9 MEDIUM | Openvswitch: open vswitch: denial of service via malformed ftp epasv command |
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V. Comments for CVE-2026-34002
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