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
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用不正确的长度值访问缓冲区
Source: NVD (National Vulnerability Database)
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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | - | cpe:/o:redhat:enterprise_linux:10 | |
| Red Hat | Red Hat Enterprise Linux 6 | - | cpe:/o:redhat:enterprise_linux:6 | |
| Red Hat | Red Hat Enterprise Linux 6 | - | cpe:/o:redhat:enterprise_linux:6 | |
| Red Hat | Red Hat Enterprise Linux 7 | - | cpe:/o:redhat:enterprise_linux:7 | |
| Red Hat | Red Hat Enterprise Linux 7 | - | cpe:/o:redhat:enterprise_linux:7 | |
| Red Hat | Red Hat Enterprise Linux 8 | - | cpe:/o:redhat:enterprise_linux:8 | |
| Red Hat | Red Hat Enterprise Linux 8 | - | cpe:/o:redhat:enterprise_linux:8 | |
| Red Hat | Red Hat Enterprise Linux 8 | - | cpe:/o:redhat:enterprise_linux:8 | |
| Red Hat | Red Hat Enterprise Linux 9 | - | cpe:/o:redhat:enterprise_linux:9 | |
| Red Hat | Red Hat Enterprise Linux 9 | - | cpe:/o:redhat:enterprise_linux:9 | |
| Red Hat | Red Hat Enterprise Linux 9 | - | cpe:/o:redhat:enterprise_linux:9 |
II. Public POCs for CVE-2026-34002
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|---|
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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 |
IV. Related Vulnerabilities
Same product: Red Hat Enterprise Linux 10
- CVE-2026-42011
Gnutls: gnutls: security bypass due to incorrect name constr - CVE-2026-42010
Gnutls: gnutls: authentication bypass via nul character in u - CVE-2026-6420
Keylime: keylime: security bypass due to hardcoded tpm quote - CVE-2026-34000
Xwayland: xorg: x.org x server: information disclosure and d - CVE-2026-2708
Libsoup: libsoup: http request smuggling via duplicate conte
Same vendor: Red Hat
- CVE-2026-42011
Gnutls: gnutls: security bypass due to incorrect name constr - CVE-2026-42010
Gnutls: gnutls: authentication bypass via nul character in u - CVE-2026-6420
Keylime: keylime: security bypass due to hardcoded tpm quote - CVE-2026-34956
Openvswitch: open vswitch: denial of service via malformed f - CVE-2026-34000
Xwayland: xorg: x.org x server: information disclosure and d
Same weakness: CWE-805
- CVE-2026-6245
Sssd: out-of-bounds read in the sssd - CVE-2026-20033
Cisco NX-OS Software Denial of Service Vulnerability - CVE-2026-20010
Cisco Nexus 3000 and 9000 Series Switches Link Layer Discove - CVE-2026-1837
libjxl: Out-of-bounds write in grayscale color transformatio - CVE-2026-0716
Libsoup: out-of-bounds read in libsoup websocket frame proce
V. Comments for CVE-2026-34002
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