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.
CVSS 7.8EPSS 0.165%Risk 0.79
View source- Published
- 2026-06-05 12:16:39
- Affected versions
- unknown
- Type
- Core software
- Last modified
- 2026-08-05 13:23:31
- Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Operating systems
- Linux