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CVE-2026-50259

7.8 HIGH

A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland

Published: 2026-06-05 · Last updated: 2026-06-08

Severity and scoring

CVSS
7.8 HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-121

Affected products

VendorProduct
redhatenterprise_linux, x_server, xwayland
x.orgenterprise_linux, x_server, xwayland

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.

Source: NVD

References

Related CVEs

Same vendor

  • CVE-2026-50258 — A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland (7.8 HIGH)
  • CVE-2026-50257 — A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence() (7.8 HIGH)
  • CVE-2026-50256 — A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland (7.8 HIGH)
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