CVE-2026-53210 tee: shm: fix shm leak in register_shm_helper()

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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      "drivers/tee/tee_shm.c"
    ],
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    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/tee/tee_shm.c"
    ],
    "versions": [
      {
        "version": "6.8",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.8",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.94",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
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      },
      {
        "version": "6.18.36",
        "lessThanOrEqual": "6.18.*",
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      },
      {
        "version": "7.0.13",
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      {
        "version": "7.1",
        "lessThanOrEqual": "*",
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    ]
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]