CVE-2026-34000: Out-of-bounds Read in Red Hat Red Hat Enterprise Linux 10
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.
AI Analysis
Technical Summary
This vulnerability involves an out-of-bounds read in the X.Org X server's XKB geometry processing code, specifically within the CheckSetGeom() and XkbAddGeomKeyAlias functions. An attacker with access to the X11 server, either locally or remotely, can exploit this flaw to read memory beyond intended bounds, potentially disclosing sensitive information or causing a denial of service by crashing the server. The issue affects Red Hat Enterprise Linux 10. The CVSS 3.1 base score is 6.1 (medium severity), with attack vector local, low attack complexity, low privileges required, no user interaction, unchanged scope, high confidentiality impact, no integrity impact, and low availability impact. The vendor advisory does not specify a remediation level or patch availability.
Potential Impact
Successful exploitation can lead to disclosure of memory contents due to out-of-bounds reads, potentially exposing sensitive information. Additionally, it may cause a denial of service by crashing the X.Org X server. The impact on confidentiality is high, while integrity is unaffected, and availability impact is low. There are no known exploits in the wild currently.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-34000 for current remediation guidance. Until an official fix is released, consider restricting access to the X11 server to trusted users only to reduce exposure. Monitor the vendor advisory for updates on patches or workarounds.
CVE-2026-34000: Out-of-bounds Read in Red Hat Red Hat Enterprise Linux 10
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves an out-of-bounds read in the X.Org X server's XKB geometry processing code, specifically within the CheckSetGeom() and XkbAddGeomKeyAlias functions. An attacker with access to the X11 server, either locally or remotely, can exploit this flaw to read memory beyond intended bounds, potentially disclosing sensitive information or causing a denial of service by crashing the server. The issue affects Red Hat Enterprise Linux 10. The CVSS 3.1 base score is 6.1 (medium severity), with attack vector local, low attack complexity, low privileges required, no user interaction, unchanged scope, high confidentiality impact, no integrity impact, and low availability impact. The vendor advisory does not specify a remediation level or patch availability.
Potential Impact
Successful exploitation can lead to disclosure of memory contents due to out-of-bounds reads, potentially exposing sensitive information. Additionally, it may cause a denial of service by crashing the X.Org X server. The impact on confidentiality is high, while integrity is unaffected, and availability impact is low. There are no known exploits in the wild currently.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-34000 for current remediation guidance. Until an official fix is released, consider restricting access to the X11 server to trusted users only to reduce exposure. Monitor the vendor advisory for updates on patches or workarounds.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-03-25T04:53:13.614Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-34000","vendor":"Red Hat"}]
Threat ID: 69fa191dcbff5d86100ff6c8
Added to database: 5/5/2026, 4:21:49 PM
Last enriched: 5/5/2026, 4:38:29 PM
Last updated: 5/6/2026, 3:25:09 AM
Views: 5
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