CVE-2025-68242 (GCVE-0-2025-68242)
Vulnerability from cvelistv5
Published
2025-12-16 14:21
Modified
2025-12-16 14:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: NFS: Fix LTP test failures when timestamps are delegated The utimes01 and utime06 tests fail when delegated timestamps are enabled, specifically in subtests that modify the atime and mtime fields using the 'nobody' user ID. The problem can be reproduced as follow: # echo "/media *(rw,no_root_squash,sync)" >> /etc/exports # export -ra # mount -o rw,nfsvers=4.2 127.0.0.1:/media /tmpdir # cd /opt/ltp # ./runltp -d /tmpdir -s utimes01 # ./runltp -d /tmpdir -s utime06 This issue occurs because nfs_setattr does not verify the inode's UID against the caller's fsuid when delegated timestamps are permitted for the inode. This patch adds the UID check and if it does not match then the request is sent to the server for permission checking.
References
Impacted products
Vendor Product Version
Linux Linux Version: e12912d94137ab36ee704a91f465ff15c8b423da
Version: e12912d94137ab36ee704a91f465ff15c8b423da
Version: e12912d94137ab36ee704a91f465ff15c8b423da
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{
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          "product": "Linux",
          "programFiles": [
            "fs/nfs/inode.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: Fix LTP test failures when timestamps are delegated\n\nThe utimes01 and utime06 tests fail when delegated timestamps are\nenabled, specifically in subtests that modify the atime and mtime\nfields using the \u0027nobody\u0027 user ID.\n\nThe problem can be reproduced as follow:\n\n# echo \"/media *(rw,no_root_squash,sync)\" \u003e\u003e /etc/exports\n# export -ra\n# mount -o rw,nfsvers=4.2 127.0.0.1:/media /tmpdir\n# cd /opt/ltp\n# ./runltp -d /tmpdir -s utimes01\n# ./runltp -d /tmpdir -s utime06\n\nThis issue occurs because nfs_setattr does not verify the inode\u0027s\nUID against the caller\u0027s fsuid when delegated timestamps are\npermitted for the inode.\n\nThis patch adds the UID check and if it does not match then the\nrequest is sent to the server for permission checking."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T14:21:19.558Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/b623390045a81fc559decb9bfeb79319721d3dfb"
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      ],
      "title": "NFS: Fix LTP test failures when timestamps are delegated",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68242",
    "datePublished": "2025-12-16T14:21:19.558Z",
    "dateReserved": "2025-12-16T13:41:40.263Z",
    "dateUpdated": "2025-12-16T14:21:19.558Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68242\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T15:15:53.430\",\"lastModified\":\"2025-12-18T15:08:06.237\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nNFS: Fix LTP test failures when timestamps are delegated\\n\\nThe utimes01 and utime06 tests fail when delegated timestamps are\\nenabled, specifically in subtests that modify the atime and mtime\\nfields using the \u0027nobody\u0027 user ID.\\n\\nThe problem can be reproduced as follow:\\n\\n# echo \\\"/media *(rw,no_root_squash,sync)\\\" \u003e\u003e /etc/exports\\n# export -ra\\n# mount -o rw,nfsvers=4.2 127.0.0.1:/media /tmpdir\\n# cd /opt/ltp\\n# ./runltp -d /tmpdir -s utimes01\\n# ./runltp -d /tmpdir -s utime06\\n\\nThis issue occurs because nfs_setattr does not verify the inode\u0027s\\nUID against the caller\u0027s fsuid when delegated timestamps are\\npermitted for the inode.\\n\\nThis patch adds the UID check and if it does not match then the\\nrequest is sent to the server for permission checking.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0e9be902041c6b9f0ed4b72764187eed1067a42f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b2e4cda71ed062c87573b016d2d956a62f4258ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b623390045a81fc559decb9bfeb79319721d3dfb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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