Red Hat Security Advisory: xorg-x11-server-Xwayland security, bug fix, and enhancement update
Multiple security vulnerabilities have been identified in the xorg-x11-server-Xwayland component of Red Hat Enterprise Linux 8. These include stack buffer overflows, use-after-free conditions, out-of-bounds read/write, and information disclosure issues affecting font alias resolution, XKB key types, GLX attributes, and DRI2 buffer handling. Red Hat has issued an important security advisory with updates addressing these issues. The vulnerabilities are rated with high severity and affect various architectures supported by Red Hat Enterprise Linux 8.
AI Analysis
Technical Summary
This advisory covers nine distinct security vulnerabilities in the xorg-x11-server-Xwayland package used in Red Hat Enterprise Linux 8. The issues include stack buffer overflows caused by font alias resolution and XKB key types, use-after-free bugs in multiple functions (miSyncDestroyFence, FreeCounter, SyncChangeCounter, CreateSaverWindow), out-of-bounds read/write in GLX ChangeDrawableAttributes, and out-of-bounds heap write in DRI2 buffer functions. These vulnerabilities stem from memory handling errors such as buffer overflows, use-after-free, and unchecked indexing. The update also backports other security fixes without CVE assignments. The advisory references Red Hat's errata RHSA-2026:26562 for detailed patch information.
Potential Impact
The vulnerabilities could allow an attacker to cause crashes, execute arbitrary code, or disclose sensitive information due to memory corruption and use-after-free conditions in the Xwayland server component. This impacts the security and stability of systems running X clients under Wayland on affected Red Hat Enterprise Linux 8 platforms. The severity is rated high by Red Hat Product Security.
Mitigation Recommendations
Red Hat has released updated packages for xorg-x11-server-Xwayland as part of Red Hat Enterprise Linux 8 updates. Users should apply these official patches promptly to remediate the vulnerabilities. Detailed update instructions and packages are available in the Red Hat advisory RHSA-2026:26562 at https://access.redhat.com/errata/RHSA-2026:26562. No additional mitigations beyond applying the vendor-provided updates are specified.
Red Hat Security Advisory: xorg-x11-server-Xwayland security, bug fix, and enhancement update
Description
Multiple security vulnerabilities have been identified in the xorg-x11-server-Xwayland component of Red Hat Enterprise Linux 8. These include stack buffer overflows, use-after-free conditions, out-of-bounds read/write, and information disclosure issues affecting font alias resolution, XKB key types, GLX attributes, and DRI2 buffer handling. Red Hat has issued an important security advisory with updates addressing these issues. The vulnerabilities are rated with high severity and affect various architectures supported by Red Hat Enterprise Linux 8.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers nine distinct security vulnerabilities in the xorg-x11-server-Xwayland package used in Red Hat Enterprise Linux 8. The issues include stack buffer overflows caused by font alias resolution and XKB key types, use-after-free bugs in multiple functions (miSyncDestroyFence, FreeCounter, SyncChangeCounter, CreateSaverWindow), out-of-bounds read/write in GLX ChangeDrawableAttributes, and out-of-bounds heap write in DRI2 buffer functions. These vulnerabilities stem from memory handling errors such as buffer overflows, use-after-free, and unchecked indexing. The update also backports other security fixes without CVE assignments. The advisory references Red Hat's errata RHSA-2026:26562 for detailed patch information.
Potential Impact
The vulnerabilities could allow an attacker to cause crashes, execute arbitrary code, or disclose sensitive information due to memory corruption and use-after-free conditions in the Xwayland server component. This impacts the security and stability of systems running X clients under Wayland on affected Red Hat Enterprise Linux 8 platforms. The severity is rated high by Red Hat Product Security.
Mitigation Recommendations
Red Hat has released updated packages for xorg-x11-server-Xwayland as part of Red Hat Enterprise Linux 8 updates. Users should apply these official patches promptly to remediate the vulnerabilities. Detailed update instructions and packages are available in the Red Hat advisory RHSA-2026:26562 at https://access.redhat.com/errata/RHSA-2026:26562. No additional mitigations beyond applying the vendor-provided updates are specified.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:26562
- Cve Count
- 9
- Additional Cves
- ["CVE-2026-50257","CVE-2026-50258","CVE-2026-50259","CVE-2026-50260","CVE-2026-50261","CVE-2026-50262","CVE-2026-50263","CVE-2026-50264"]
- Cvss Version
- null
Threat ID: 6a32cef49f87a2db092a2a2f
Added to database: 6/17/2026, 4:44:36 PM
Last enriched: 6/17/2026, 5:07:07 PM
Last updated: 6/17/2026, 6:23:43 PM
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.