CVE-2026-23327 cxl/mbox: validate payload size before accessing contents in cxl_payload_from_user_allowed()

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/cxl/core/mbox.c"
    ],
    "versions": [
      {
        "version": "6179045ccc0c6229dc449afc1701dc7fbd40571f",
        "lessThan": "dc184ac2f0ba77ae19725ee06ad3ab36bb9d1f61",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6179045ccc0c6229dc449afc1701dc7fbd40571f",
        "lessThan": "7c8a7b7f063b7e7ae9bba4cbaa14a5d2fe3a55e1",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6179045ccc0c6229dc449afc1701dc7fbd40571f",
        "lessThan": "60b5d1f68338aff2c5af0113f04aefa7169c50c2",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/cxl/core/mbox.c"
    ],
    "versions": [
      {
        "version": "5.19",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.19",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.34",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.19.7",
        "lessThanOrEqual": "6.19.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.0",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]