X.Org Server XKB SetMap Key Width/Action Count Desync Out-Of-Bounds Read

{
  "id": "7be9c6116dde6d0e2593135bf267c6349a6da256318e1b0d1e1aad95209ebb01",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-93524",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "X.Org Server XKB SetMap Key Width/Action Count Desync Out-Of-Bounds Read",
    "summary": "A buffer overread in CheckKeySyms() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to leak small amounts of information from X server memory or potentially crash the X server.",
    "evidence": "cve:CVE-2026-93524",
    "products": [
      {
        "name": {
          "value": "xorg-x11-server",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "xwayland",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-93524",
      "aliases": [
        "CVE-2026-93524"
      ],
      "metrics": [
        {
          "format": "CVSS",
          "cvssV4_0": {
            "Safety": "NOT_DEFINED",
            "version": "4.0",
            "Recovery": "NOT_DEFINED",
            "baseScore": 6.9,
            "Automatable": "NOT_DEFINED",
            "attackVector": "LOCAL",
            "baseSeverity": "MEDIUM",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N",
            "exploitMaturity": "NOT_DEFINED",
            "providerUrgency": "NOT_DEFINED",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "privilegesRequired": "LOW",
            "subIntegrityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "subAvailabilityImpact": "NONE",
            "vulnAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "affected": [
        {
          "repo": "https://gitlab.freedesktop.org/xorg/xserver",
          "vendor": "x.org",
          "product": "xorg-x11-server",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "21.1.25",
              "versionType": "rpm"
            }
          ],
          "packageName": "xorg-x11-server",
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://gitlab.freedesktop.org/xorg/xserver",
          "vendor": "x.org",
          "product": "xwayland",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "24.1.14",
              "versionType": "rpm"
            }
          ],
          "packageName": "xwayland",
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-28T16:24:52.508Z",
      "provider": "cve",
      "references": [
        "https://gitlab.freedesktop.org/xorg/xserver/-/commit/cea71d0273e4d5092aa9c6a8a770734c8935c02e"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb",
          "shortName": "suse",
          "dateUpdated": "2026-10-28T16:24:52.508Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-93524",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 460292,
  "published_at": "2026-10-28T16:24:52.508+00:00"
}