Red Hat Security Advisory: xorg-x11-server-Xwayland security update
Two security vulnerabilities affecting xorg-x11-server-Xwayland in Red Hat Enterprise Linux 10 have been addressed. These include a heap buffer overflow in the glamor Font Atlas component (CVE-2026-55999) and a use-after-free vulnerability in GLX contextTags within CommonMakeCurrent() (CVE-2026-56000). Both issues are rated with high severity by Red Hat Product Security. An update is available to remediate these vulnerabilities.
AI Analysis
Technical Summary
The Red Hat security advisory RHSA-2026:38489 addresses two vulnerabilities in xorg-x11-server-Xwayland, the X server for running X clients under Wayland. CVE-2026-55999 is a heap buffer overflow in the glamor Font Atlas component, and CVE-2026-56000 is a use-after-free vulnerability in GLX contextTags in the CommonMakeCurrent() function. Both vulnerabilities could potentially lead to memory corruption. Red Hat has released patches for these issues in Red Hat Enterprise Linux 10 and related CodeReady Linux Builder variants. The advisory provides detailed package updates and references for remediation.
Potential Impact
The vulnerabilities could allow an attacker to cause memory corruption via heap buffer overflow or use-after-free conditions in the Xwayland server, potentially leading to denial of service or other unintended behavior. Red Hat rates the security impact as Important (high severity). There are no known exploits in the wild at this time.
Mitigation Recommendations
A security update for xorg-x11-server-Xwayland is available for Red Hat Enterprise Linux 10 and related products. Users should apply the update as described in the Red Hat advisory RHSA-2026:38489 and the referenced article https://access.redhat.com/articles/11258 to remediate these vulnerabilities. No additional mitigation steps are indicated by the vendor.
Red Hat Security Advisory: xorg-x11-server-Xwayland security update
Description
Two security vulnerabilities affecting xorg-x11-server-Xwayland in Red Hat Enterprise Linux 10 have been addressed. These include a heap buffer overflow in the glamor Font Atlas component (CVE-2026-55999) and a use-after-free vulnerability in GLX contextTags within CommonMakeCurrent() (CVE-2026-56000). Both issues are rated with high severity by Red Hat Product Security. An update is available to remediate these vulnerabilities.
Affected software
pkg:rpm/redhat/xorg-x11-server-XwaylandRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Red Hat security advisory RHSA-2026:38489 addresses two vulnerabilities in xorg-x11-server-Xwayland, the X server for running X clients under Wayland. CVE-2026-55999 is a heap buffer overflow in the glamor Font Atlas component, and CVE-2026-56000 is a use-after-free vulnerability in GLX contextTags in the CommonMakeCurrent() function. Both vulnerabilities could potentially lead to memory corruption. Red Hat has released patches for these issues in Red Hat Enterprise Linux 10 and related CodeReady Linux Builder variants. The advisory provides detailed package updates and references for remediation.
Potential Impact
The vulnerabilities could allow an attacker to cause memory corruption via heap buffer overflow or use-after-free conditions in the Xwayland server, potentially leading to denial of service or other unintended behavior. Red Hat rates the security impact as Important (high severity). There are no known exploits in the wild at this time.
Mitigation Recommendations
A security update for xorg-x11-server-Xwayland is available for Red Hat Enterprise Linux 10 and related products. Users should apply the update as described in the Red Hat advisory RHSA-2026:38489 and the referenced article https://access.redhat.com/articles/11258 to remediate these vulnerabilities. No additional mitigation steps are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:38489
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-56000"]
- Cvss Version
- null
Threat ID: 6a54ade268715ace438f5e6d
Added to database: 07/13/2026, 09:20:34 UTC
Last enriched: 08/11/2026, 20:07:45 UTC
Last updated: 08/27/2026, 10:52:09 UTC
Views: 66
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