Red Hat Security Advisory: xorg-x11-server-Xwayland security update
Multiple vulnerabilities have been identified in the Xwayland component of the X. Org X server used in Red Hat Enterprise Linux 9. These include a denial of service via integer underflow (CVE-2026-33999), a use-after-free vulnerability causing server crashes and potential memory corruption (CVE-2026-34001), and information exposure plus denial of service via out-of-bounds memory access (CVE-2026-34003). Red Hat has issued an important security advisory with updates addressing these issues. The vulnerabilities affect various architectures and editions of Red Hat Enterprise Linux 9 and related CodeReady Linux Builder products. The advisory provides updated packages to remediate these vulnerabilities.
AI Analysis
Technical Summary
The Xwayland server component in Red Hat Enterprise Linux 9 contains three security vulnerabilities: an integer underflow in XKB compatibility map handling leading to denial of service (CVE-2026-33999), a use-after-free vulnerability that can cause server crashes and potential memory corruption (CVE-2026-34001), and an out-of-bounds memory access vulnerability resulting in information exposure and denial of service (CVE-2026-34003). These issues are addressed by updated xorg-x11-server-Xwayland packages provided by Red Hat in advisory RHSA-2026:11369. The vulnerabilities impact multiple CPU architectures including x86_64, s390x, ppc64le, and aarch64. Red Hat rates the update as important and provides detailed instructions and packages for remediation.
Potential Impact
Successful exploitation of these vulnerabilities could lead to denial of service conditions by crashing the Xwayland server or causing memory corruption. Additionally, one vulnerability may expose sensitive information due to out-of-bounds memory access. These impacts affect the stability and confidentiality of systems running affected Red Hat Enterprise Linux 9 versions and related products.
Mitigation Recommendations
Red Hat has released updated xorg-x11-server-Xwayland packages that address these vulnerabilities. Users of affected Red Hat Enterprise Linux 9 and related CodeReady Linux Builder versions should apply the updates as described in Red Hat advisory RHSA-2026:11369 (https://access.redhat.com/errata/RHSA-2026:11369). No additional mitigations are indicated beyond applying the official patches.
Red Hat Security Advisory: xorg-x11-server-Xwayland security update
Description
Multiple vulnerabilities have been identified in the Xwayland component of the X. Org X server used in Red Hat Enterprise Linux 9. These include a denial of service via integer underflow (CVE-2026-33999), a use-after-free vulnerability causing server crashes and potential memory corruption (CVE-2026-34001), and information exposure plus denial of service via out-of-bounds memory access (CVE-2026-34003). Red Hat has issued an important security advisory with updates addressing these issues. The vulnerabilities affect various architectures and editions of Red Hat Enterprise Linux 9 and related CodeReady Linux Builder products. The advisory provides updated packages to remediate these vulnerabilities.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Xwayland server component in Red Hat Enterprise Linux 9 contains three security vulnerabilities: an integer underflow in XKB compatibility map handling leading to denial of service (CVE-2026-33999), a use-after-free vulnerability that can cause server crashes and potential memory corruption (CVE-2026-34001), and an out-of-bounds memory access vulnerability resulting in information exposure and denial of service (CVE-2026-34003). These issues are addressed by updated xorg-x11-server-Xwayland packages provided by Red Hat in advisory RHSA-2026:11369. The vulnerabilities impact multiple CPU architectures including x86_64, s390x, ppc64le, and aarch64. Red Hat rates the update as important and provides detailed instructions and packages for remediation.
Potential Impact
Successful exploitation of these vulnerabilities could lead to denial of service conditions by crashing the Xwayland server or causing memory corruption. Additionally, one vulnerability may expose sensitive information due to out-of-bounds memory access. These impacts affect the stability and confidentiality of systems running affected Red Hat Enterprise Linux 9 versions and related products.
Mitigation Recommendations
Red Hat has released updated xorg-x11-server-Xwayland packages that address these vulnerabilities. Users of affected Red Hat Enterprise Linux 9 and related CodeReady Linux Builder versions should apply the updates as described in Red Hat advisory RHSA-2026:11369 (https://access.redhat.com/errata/RHSA-2026:11369). No additional mitigations are indicated beyond applying the official patches.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:11369
- Cve Count
- 3
- Additional Cves
- ["CVE-2026-34001","CVE-2026-34003"]
- Cvss Version
- null
Threat ID: 6a160980e29bf47b5064dbdc
Added to database: 5/26/2026, 8:58:40 PM
Last enriched: 5/26/2026, 9:50:34 PM
Last updated: 5/27/2026, 4:50:20 AM
Views: 2
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