CVE intelligence and bounded remediation

CVE-2025-26597 — A buffer overflow flaw was found in X.Org and Xwayland

High CVSS 7.8

A buffer overflow flaw was found in X.Org and Xwayland. If XkbChangeTypesOfKey() is called with a 0 group, it will resize the key symbols table to 0 but leave the key actions unchanged. If the same function is later called with a non-zero value of groups, this will cause a buffer overflow because the key actions are of the wrong size.

Severity
High
CVSS
7.8 (3.1)
Published
2025-02-25
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-119

Affected products

  • tigervnc / tigervnc
  • x.org / x_server
  • x.org / xwayland
  • redhat / enterprise_linux / 7.0
  • redhat / enterprise_linux / 8.0
  • redhat / enterprise_linux / 9.0

Matched remediation archetype

Buffer bounds, memory safety, and memory corruption

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Identify affected native-code versions, build flags, architectures, parsers, codecs, drivers, and input paths in all shipped artifacts.
  • Determine whether untrusted data reaches the affected routine and the process privilege, sandbox, and network exposure.
  • Confirm statically linked, vendored, firmware, and platform-provided copies, not only package-manager records.

Remediate safely

  • Apply the maintained upstream correction or replace the affected component, then rebuild every dependent artifact from clean inputs.
  • Adopt bounds-checked interfaces, validated sizes and integer conversions, clear ownership, and memory-safe components where practical.
  • Enable supported compiler and runtime hardening and add sanitized tests and fuzz regression seeds derived from non-weaponized fixtures.

Authoritative sources

Complete CVE record and remediation plan

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