CVE-2026-34002: Buffer Access with Incorrect Length Value in Red Hat Red Hat Enterprise Linux 10
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.
AI Analysis
Technical Summary
This vulnerability in the X.Org X server's XKB modifier map handling allows an attacker with local access to the X11 server to trigger an out-of-bounds read by sending a malformed request. The flaw leads to reading memory beyond allocated bounds, potentially exposing sensitive data or causing the server to crash, resulting in denial of service. The CVSS 3.1 base score is 6.1, reflecting medium severity with local attack vector, 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 currently specify remediation or patch availability.
Potential Impact
Successful exploitation can lead to exposure of sensitive information due to out-of-bounds memory reads or cause the X.Org X server to crash, resulting in denial of service. The confidentiality impact is high, while integrity is unaffected and availability impact is low. The attack requires local access to the X11 server and low privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-34002 for current remediation guidance. Until a patch is available, restrict access to the X11 server to trusted users only to reduce risk. Monitor the vendor advisory for updates on fixes or workarounds.
CVE-2026-34002: Buffer Access with Incorrect Length Value in Red Hat Red Hat Enterprise Linux 10
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in the X.Org X server's XKB modifier map handling allows an attacker with local access to the X11 server to trigger an out-of-bounds read by sending a malformed request. The flaw leads to reading memory beyond allocated bounds, potentially exposing sensitive data or causing the server to crash, resulting in denial of service. The CVSS 3.1 base score is 6.1, reflecting medium severity with local attack vector, 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 currently specify remediation or patch availability.
Potential Impact
Successful exploitation can lead to exposure of sensitive information due to out-of-bounds memory reads or cause the X.Org X server to crash, resulting in denial of service. The confidentiality impact is high, while integrity is unaffected and availability impact is low. The attack requires local access to the X11 server and low privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-34002 for current remediation guidance. Until a patch is available, restrict access to the X11 server to trusted users only to reduce risk. Monitor the vendor advisory for updates on fixes or workarounds.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-03-25T04:53:13.615Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-34002","vendor":"Red Hat"}]
Threat ID: 69fa191dcbff5d86100ff6cc
Added to database: 5/5/2026, 4:21:49 PM
Last enriched: 5/5/2026, 4:38:20 PM
Last updated: 5/6/2026, 3:55:07 AM
Views: 4
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