Bug 2485383 (CVE-2026-50258)
| Summary: | CVE-2026-50258 xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due to unchecked shift levels | ||
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| Product: | [Other] Security Response | Reporter: | OSIDB Bzimport <bzimport> |
| Component: | vulnerability | Assignee: | Product Security DevOps Team <prodsec-dev> |
| Status: | NEW --- | QA Contact: | |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | unspecified | CC: | rhel-process-autobot, watson-tool-maintainers |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | --- | |
| Doc Text: |
A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized XkbMaxShiftLevel * XkbNumKbdGroups but CheckKeyTypes() does not verify or clamp non-canonical key types to XkbMaxShiftLevel. A client can change key types to excessive shift levels and trigger stack overflows. This is caused by an incomplete fix of CVE-2025-26597. This may be used to crash the server, or for privilege escalation if the X server runs as root.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | Type: | --- | |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
OSIDB Bzimport
2026-06-05 08:11:52 UTC
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:26562 https://access.redhat.com/errata/RHSA-2026:26562 This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:26590 https://access.redhat.com/errata/RHSA-2026:26590 This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:26610 https://access.redhat.com/errata/RHSA-2026:26610 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:26709 https://access.redhat.com/errata/RHSA-2026:26709 This issue has been addressed in the following products: Red Hat Enterprise Linux 10 Via RHSA-2026:26566 https://access.redhat.com/errata/RHSA-2026:26566 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:28923 https://access.redhat.com/errata/RHSA-2026:28923 This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:29844 https://access.redhat.com/errata/RHSA-2026:29844 This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Extended Lifecycle Support Via RHSA-2026:36083 https://access.redhat.com/errata/RHSA-2026:36083 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Via RHSA-2026:36086 https://access.redhat.com/errata/RHSA-2026:36086 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Via RHSA-2026:36087 https://access.redhat.com/errata/RHSA-2026:36087 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:36085 https://access.redhat.com/errata/RHSA-2026:36085 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Via RHSA-2026:36633 https://access.redhat.com/errata/RHSA-2026:36633 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Via RHSA-2026:36632 https://access.redhat.com/errata/RHSA-2026:36632 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:36634 https://access.redhat.com/errata/RHSA-2026:36634 This issue has been addressed in the following products: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat Enterprise Linux 8.8 Telecommunications Update Service Via RHSA-2026:36768 https://access.redhat.com/errata/RHSA-2026:36768 This issue has been addressed in the following products: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Via RHSA-2026:36791 https://access.redhat.com/errata/RHSA-2026:36791 This issue has been addressed in the following products: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Via RHSA-2026:36792 https://access.redhat.com/errata/RHSA-2026:36792 This issue has been addressed in the following products: Red Hat Enterprise Linux 10.0 Extended Update Support Via RHSA-2026:36798 https://access.redhat.com/errata/RHSA-2026:36798 This issue has been addressed in the following products: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat Enterprise Linux 8.8 Telecommunications Update Service Via RHSA-2026:38502 https://access.redhat.com/errata/RHSA-2026:38502 This issue has been addressed in the following products: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Via RHSA-2026:38810 https://access.redhat.com/errata/RHSA-2026:38810 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Via RHSA-2026:46377 https://access.redhat.com/errata/RHSA-2026:46377 This issue has been addressed in the following products: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Via RHSA-2026:46382 https://access.redhat.com/errata/RHSA-2026:46382 This issue has been addressed in the following products: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat Enterprise Linux 8.8 Telecommunications Update Service Via RHSA-2026:46385 https://access.redhat.com/errata/RHSA-2026:46385 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:46392 https://access.redhat.com/errata/RHSA-2026:46392 This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Via RHSA-2026:46456 https://access.redhat.com/errata/RHSA-2026:46456 This issue has been addressed in the following products: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Via RHSA-2026:46460 https://access.redhat.com/errata/RHSA-2026:46460 This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Extended Lifecycle Support Via RHSA-2026:46473 https://access.redhat.com/errata/RHSA-2026:46473 This issue has been addressed in the following products: Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION Via RHSA-2026:49519 https://access.redhat.com/errata/RHSA-2026:49519 |