Yüksek CVSS 7.8

CVE-2026-50258: X Server: yığıt (stack) taşması

Yayın: 5 Haziran 2026 15:16 · Güncelleme: 6 Kasım 2026 10:19

Açıklama (NVD)

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.

Özet bilgiler

Ürün: X.org X Server
CVSS v3.1: 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: %0,16 (yüzdelik 5)
CWE: CWE-121
Yama: Mevcut

Etkilenen sürümler

Ürün	Başlangıç	Bitiş	Düzeltildi
x.org-x-server	—	—	21.1.23
x.org-xwayland	—	—	24.1.12
redhat-enterprise-linux	7.0	7.0	—
redhat-enterprise-linux	8.0	8.0	—
redhat-enterprise-linux	9.0	9.0	—
redhat-enterprise-linux	10.0	10.0	—

Kaynaklar

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