CVE-2026-43499 rtmutex: Use waiter::task instead of current in remove_waiter()

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/locking/rtmutex.c"
    ],
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    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/locking/rtmutex.c"
    ],
    "versions": [
      {
        "version": "2.6.39",
        "status": "affected"
      },
      {
        "version": "0",
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        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.1.175",
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      },
      {
        "version": "6.6.140",
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      },
      {
        "version": "6.12.86",
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      {
        "version": "6.18.27",
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      {
        "version": "7.0.4",
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      {
        "version": "7.1-rc1",
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        "versionType": "original_commit_for_fix"
      }
    ]
  }
]