VULNERABILITY INTELLIGENCE
CVE-2026-50258
CVSS score7.8 HIGH
EPSS probability0.16%
CISA KEVNot currently listed
Published2026-06-05
Last modified2026-08-05
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Description
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.
Weakness classification
- secalert@redhat.com: CWE-121
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-121