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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
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.
Metrics
NVD enrichment efforts reference publicly available information to associate
vector strings. CVSS information contributed by other sources is also
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CVE Modified by Red Hat, Inc.5/26/2026 12:16:26 AM
Action
Type
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New Value
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Reference
https://access.redhat.com/errata/RHSA-2026:20560
CVE Modified by Red Hat, Inc.5/25/2026 10:16:39 PM
Action
Type
Old Value
New Value
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Reference
https://access.redhat.com/errata/RHSA-2026:20562
CVE Modified by Red Hat, Inc.5/20/2026 12:16:52 AM
Action
Type
Old Value
New Value
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Reference
https://access.redhat.com/errata/RHSA-2026:19342
Initial Analysis by NIST5/07/2026 10:35:33 AM
Action
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CVSS V3.1
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Added
CPE Configuration
OR
*cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
*cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
*cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
*cpe:2.3:a:x.org:x_server:-:*:*:*:*:*:*:*
*cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
*cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-34000 Types: Third Party Advisory
Added
Reference Type
Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2451107 Types: Issue Tracking, Third Party Advisory
New CVE Received from Red Hat, Inc.5/05/2026 12:16:11 PM
Action
Type
Old Value
New Value
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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.