CVE-2026-68173 ublk: wait on ublk_dev_ready() instead of ub->completion

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/block/ublk_drv.c"
    ],
    "versions": [
      {
        "version": "728cbac5fe219d3b8a21a0688a08f2b7f8aeda2b",
        "lessThan": "7dd26adf7e7d482af524e3a0cca4a81ef7c159d0",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "728cbac5fe219d3b8a21a0688a08f2b7f8aeda2b",
        "lessThan": "8f188dd11a1c2ad94caeaee36ef68bb8221d4a12",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "728cbac5fe219d3b8a21a0688a08f2b7f8aeda2b",
        "lessThan": "432a9b2780c0a01caf547bd1fc2fcf28aeb8d173",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "42ea64e01c96e594fb4f80c54dfe4f934d008a6e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6.14.6",
        "lessThan": "6.15",
        "status": "affected",
        "versionType": "semver"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/block/ublk_drv.c"
    ],
    "versions": [
      {
        "version": "6.15",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.15",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.42",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.1.6",
        "lessThanOrEqual": "7.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.2-rc5",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]