Red Hat Security Advisory: xorg-x11-server-Xwayland security update
Xwayland is an X server for running X clients under Wayland. Security Fix(es): * xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling (CVE-2026-33999) * xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption (CVE-2026-34001) * xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access (CVE-2026-34003) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
AI Analysis
Technical Summary
The Xwayland server in Red Hat Enterprise Linux 9 contains three distinct vulnerabilities: CVE-2026-33999 is an integer underflow in the XKB compatibility map handling that can cause denial of service; CVE-2026-34001 is a use-after-free vulnerability that may lead to server crashes and potential memory corruption; CVE-2026-34003 involves out-of-bounds memory access resulting in information exposure and denial of service. These vulnerabilities affect multiple architectures and variants of Red Hat Enterprise Linux 9 and its CodeReady Linux Builder. Red Hat has released updated packages to remediate these issues as detailed in advisory RHSA-2026:19344.
Potential Impact
Successful exploitation of these vulnerabilities could cause denial of service conditions by crashing the Xwayland server, potentially leading to memory corruption and information disclosure. This can disrupt graphical session operations for X clients running under Wayland on affected Red Hat Enterprise Linux 9 systems.
Mitigation Recommendations
Red Hat has released official security updates for xorg-x11-server-Xwayland as part of Red Hat Enterprise Linux 9 and related variants. Applying these updates as per Red Hat advisory RHSA-2026:19344 will remediate the vulnerabilities. Users should follow the update instructions provided by Red Hat at https://access.redhat.com/articles/11258 to ensure their systems are protected.
Red Hat Security Advisory: xorg-x11-server-Xwayland security update
Description
Xwayland is an X server for running X clients under Wayland. Security Fix(es): * xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling (CVE-2026-33999) * xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption (CVE-2026-34001) * xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory access (CVE-2026-34003) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Xwayland server in Red Hat Enterprise Linux 9 contains three distinct vulnerabilities: CVE-2026-33999 is an integer underflow in the XKB compatibility map handling that can cause denial of service; CVE-2026-34001 is a use-after-free vulnerability that may lead to server crashes and potential memory corruption; CVE-2026-34003 involves out-of-bounds memory access resulting in information exposure and denial of service. These vulnerabilities affect multiple architectures and variants of Red Hat Enterprise Linux 9 and its CodeReady Linux Builder. Red Hat has released updated packages to remediate these issues as detailed in advisory RHSA-2026:19344.
Potential Impact
Successful exploitation of these vulnerabilities could cause denial of service conditions by crashing the Xwayland server, potentially leading to memory corruption and information disclosure. This can disrupt graphical session operations for X clients running under Wayland on affected Red Hat Enterprise Linux 9 systems.
Mitigation Recommendations
Red Hat has released official security updates for xorg-x11-server-Xwayland as part of Red Hat Enterprise Linux 9 and related variants. Applying these updates as per Red Hat advisory RHSA-2026:19344 will remediate the vulnerabilities. Users should follow the update instructions provided by Red Hat at https://access.redhat.com/articles/11258 to ensure their systems are protected.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:19344
- Cve Count
- 3
- Additional Cves
- ["CVE-2026-34001","CVE-2026-34003"]
- Cvss Version
- null
Threat ID: 6a160980e29bf47b5064d58c
Added to database: 05/26/2026, 20:58:40 UTC
Last enriched: 06/25/2026, 23:46:11 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 69
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