A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256] indexed by key type index. The helper function CheckKeyTypes() writes to this buffer at a client-controlled offset, allowing a stack buffer overflow. This may be used to crash the server, or for privilege escalation if the X server runs as root.
Metrics
Affected Vendors & Products
References
History
Fri, 05 Jun 2026 13:30:00 +0000
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ssvc
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Fri, 05 Jun 2026 12:15:00 +0000
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threat_severity
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threat_severity
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Fri, 05 Jun 2026 11:45:00 +0000
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| Description | A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256] indexed by key type index. The helper function CheckKeyTypes() writes to this buffer at a client-controlled offset, allowing a stack buffer overflow. This may be used to crash the server, or for privilege escalation if the X server runs as root. | |
| Title | Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in xkb setmap request via mapwidths indexing | |
| First Time appeared |
Redhat
Redhat enterprise Linux |
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| Weaknesses | CWE-121 | |
| CPEs | cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:6 cpe:/o:redhat:enterprise_linux:7 cpe:/o:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:9 |
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| Vendors & Products |
Redhat
Redhat enterprise Linux |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-06-05T13:00:28.347Z
Reserved: 2026-06-04T14:55:24.011Z
Link: CVE-2026-50259
Updated: 2026-06-05T13:00:24.211Z
Status : Undergoing Analysis
Published: 2026-06-05T12:16:39.240
Modified: 2026-06-05T13:27:38.750
Link: CVE-2026-50259
OpenCVE Enrichment
Updated: 2026-06-05T12:30:40Z