CVE-2026-53341 fhandle: fix UAF due to unlocked ->mnt_ns read in may_decode_fh()

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/fhandle.c",
      "fs/mount.h",
      "fs/namespace.c"
    ],
    "versions": [
      {
        "version": "620c266f394932e5decc4b34683a75dfc59dc2f4",
        "lessThan": "32138633e51e6db59e474765cf93268c92b42888",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "620c266f394932e5decc4b34683a75dfc59dc2f4",
        "lessThan": "a8ed2c29fcfdac78db96c9da4e659c8a513f2a94",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "620c266f394932e5decc4b34683a75dfc59dc2f4",
        "lessThan": "40ab6644b99685755f740b872c00ef40d9aa870e",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/fhandle.c",
      "fs/mount.h",
      "fs/namespace.c"
    ],
    "versions": [
      {
        "version": "6.11",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.11",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.36",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.0.13",
        "lessThanOrEqual": "7.0.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]