CVE-2026-53064 dm cache: fix null-deref with concurrent writes in passthrough mode

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/md/dm-cache-target.c"
    ],
    "versions": [
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    "programFiles": [
      "drivers/md/dm-cache-target.c"
    ],
    "versions": [
      {
        "version": "4.12",
        "status": "affected"
      },
      {
        "version": "0",
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        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.10.258",
        "lessThanOrEqual": "5.10.*",
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      },
      {
        "version": "5.15.209",
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      },
      {
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      {
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      {
        "version": "7.1",
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    ]
  }
]