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CVE-2026-34000— Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.

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存在缓冲区错误漏洞，该漏洞源于XKB几何处理中CheckSetGeom和XkbAddGeomKeyAlias函数存在越界读取，可能导致内存内容泄露或服务器崩溃。

CVSS 6.1 · Medium EPSS 0.53% · P42 Updated Jun 13, 2026

Possible ATT&CK Techniques 2 AI

T1499 · Endpoint Denial of Service T1213 · Data from Information Repositories

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	`0:1.15.0-7.el9_8.1< *`	unaffected
		`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-2026-34000

Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

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Vulnerability Title

Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.

Source: CVE Program / CVE List V5

Vulnerability Description

A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server.

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

跨界内存读

Source: CVE Program / CVE List V5

Vulnerability Title

X.Org X Server 缓冲区错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

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
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	0:24.1.5-6.el10_0 ~ *	`cpe:/o:redhat:enterprise_linux_eus:10.0`
Red Hat	Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION	0:1.1.0-25.el6_10.16 ~ *	`cpe:/o:redhat:rhel_els:6`
Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	0:1.20.4-34.el7_9 ~ *	`cpe:/o:redhat:rhel_els:7`
Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	0:1.8.0-36.el7_9.4 ~ *	`cpe:/o:redhat:rhel_els:7`
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	0:1.20.10-4.el8_4 ~ *	`cpe:/a:redhat:rhel_aus:8.4::appstream`
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	0:1.11.0-8.el8_4.15 ~ *	`cpe:/a:redhat:rhel_aus:8.4::appstream`
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	0:1.20.10-4.el8_4 ~ *	`cpe:/a:redhat:rhel_aus:8.4::appstream`
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	0:1.11.0-8.el8_4.15 ~ *	`cpe:/a:redhat:rhel_aus:8.4::appstream`
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	0:21.1.3-2.el8_6.6 ~ *	`cpe:/a:redhat:rhel_aus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	0:1.20.11-7.el8_6 ~ *	`cpe:/a:redhat:rhel_aus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	0:1.12.0-6.el8_6.17 ~ *	`cpe:/a:redhat:rhel_aus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	0:1.12.0-6.el8_6.17 ~ *	`cpe:/a:redhat:rhel_aus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 8.6 Telecommunications Update Service	0:21.1.3-2.el8_6.6 ~ *	`cpe:/a:redhat:rhel_aus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 8.6 Telecommunications Update Service	0:1.20.11-7.el8_6 ~ *	`cpe:/a:redhat:rhel_aus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions	0:21.1.3-2.el8_6.6 ~ *	`cpe:/a:redhat:rhel_aus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions	0:1.20.11-7.el8_6 ~ *	`cpe:/a:redhat:rhel_aus:8.6::appstream`
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	0:21.1.3-13.el8_8 ~ *	`cpe:/a:redhat:rhel_e4s:8.8::appstream`
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	0:1.20.11-18.el8_8 ~ *	`cpe:/a:redhat:rhel_e4s:8.8::appstream`
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	0:1.12.0-15.el8_8.17 ~ *	`cpe:/a:redhat:rhel_e4s:8.8::appstream`
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	0:21.1.3-13.el8_8 ~ *	`cpe:/a:redhat:rhel_e4s:8.8::appstream`
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	0:1.20.11-18.el8_8 ~ *	`cpe:/a:redhat:rhel_e4s:8.8::appstream`
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	0:1.12.0-15.el8_8.17 ~ *	`cpe:/a:redhat:rhel_e4s:8.8::appstream`
Red Hat	Red Hat Enterprise Linux 9	0:1.15.0-7.el9_8.1 ~ *	`cpe:/a:redhat:enterprise_linux:9::appstream`
Red Hat	Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions	0:21.1.3-5.el9_0 ~ *	`cpe:/a:redhat:rhel_e4s:9.0::appstream`
Red Hat	Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions	0:1.20.11-13.el9_0 ~ *	`cpe:/a:redhat:rhel_e4s:9.0::appstream`
Red Hat	Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions	0:1.11.0-22.el9_0.17 ~ *	`cpe:/a:redhat:rhel_e4s:9.0::appstream`
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	0:21.1.3-10.el9_2 ~ *	`cpe:/a:redhat:rhel_e4s:9.2::appstream`
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	0:1.20.11-20.el9_2 ~ *	`cpe:/a:redhat:rhel_e4s:9.2::appstream`
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	0:1.12.0-14.el9_2.14 ~ *	`cpe:/a:redhat:rhel_e4s:9.2::appstream`
Red Hat	Red Hat Enterprise Linux 9.4 Extended Update Support	0:1.20.11-28.el9_4 ~ *	`cpe:/a:redhat:rhel_eus:9.4::appstream`

II. Public POCs for CVE-2026-34000

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-34000

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-34000 (13)

🔗 CVE-2026-34000 - Red Hat Customer Portal Read full article vdb-entry x_refsource_REDHAT
🔗 2451107 – (CVE-2026-34000) CVE-2026-34000 xwayland: xorg: X.Org X server: Information disclosure and denial of service via out-of-bounds read in XKB geometry processing. issue-tracking x_refsource_REDHAT
🔗 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-2026:19342 - 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-2026:23255 - Security Advisory - Red Hat Customer Portal 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-2026-34000 (14)

https://access.redhat.com/errata/RHSA-2026:21715 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20576 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20562 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20575 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20590 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20555 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22424 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21712 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21742 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20547 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21716 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22456 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21699 vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21741 vendor-advisory x_refsource_REDHAT

https://www.cve.org/CVERecord?id=CVE-2026-34000

Same Patch Batch · Red Hat · 2026-05-05 · 3 CVEs total

CVE-2026-34002	6.1 MEDIUM	Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bou
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 10.0 Extended Update Support

Same vendor: Red Hat

Same weakness: CWE-125

V. Comments for CVE-2026-34000

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-34000— Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.

Quick assessment

Possible ATT&CK Techniques 2 AI

Affected Version Matrix 42

I. Basic Information for CVE-2026-34000

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-34000

III. Intelligence Information for CVE-2026-34000

Vendor Advisories for CVE-2026-34000 (13)

Other References for CVE-2026-34000 (14)

Same Patch Batch · Red Hat · 2026-05-05 · 3 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-34000

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