ghsa-63cx-f5q6-6hg2
Vulnerability from github
Published
2025-07-25 18:30
Modified
2025-07-25 18:30
Details

In the Linux kernel, the following vulnerability has been resolved:

md/md-bitmap: fix GPF in bitmap_get_stats()

The commit message of commit 6ec1f0239485 ("md/md-bitmap: fix stats collection for external bitmaps") states:

Remove the external bitmap check as the statistics should be
available regardless of bitmap storage location.

Return -EINVAL only for invalid bitmap with no storage (neither in
superblock nor in external file).

But, the code does not adhere to the above, as it does only check for a valid super-block for "internal" bitmaps. Hence, we observe:

Oops: GPF, probably for non-canonical address 0x1cd66f1f40000028 RIP: 0010:bitmap_get_stats+0x45/0xd0 Call Trace:

seq_read_iter+0x2b9/0x46a seq_read+0x12f/0x180 proc_reg_read+0x57/0xb0 vfs_read+0xf6/0x380 ksys_read+0x6d/0xf0 do_syscall_64+0x8c/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e

We fix this by checking the existence of a super-block for both the internal and external case.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38451"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-25T16:15:30Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/md-bitmap: fix GPF in bitmap_get_stats()\n\nThe commit message of commit 6ec1f0239485 (\"md/md-bitmap: fix stats\ncollection for external bitmaps\") states:\n\n    Remove the external bitmap check as the statistics should be\n    available regardless of bitmap storage location.\n\n    Return -EINVAL only for invalid bitmap with no storage (neither in\n    superblock nor in external file).\n\nBut, the code does not adhere to the above, as it does only check for\na valid super-block for \"internal\" bitmaps. Hence, we observe:\n\nOops: GPF, probably for non-canonical address 0x1cd66f1f40000028\nRIP: 0010:bitmap_get_stats+0x45/0xd0\nCall Trace:\n\n seq_read_iter+0x2b9/0x46a\n seq_read+0x12f/0x180\n proc_reg_read+0x57/0xb0\n vfs_read+0xf6/0x380\n ksys_read+0x6d/0xf0\n do_syscall_64+0x8c/0x1b0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nWe fix this by checking the existence of a super-block for both the\ninternal and external case.",
  "id": "GHSA-63cx-f5q6-6hg2",
  "modified": "2025-07-25T18:30:39Z",
  "published": "2025-07-25T18:30:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38451"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d82a729530bd2110ba66e4a1f73461c776edec2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3e0542701b37aa25b025d8531583458e4f014c2e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a18f9b08c70e10ea3a897058fee8a4f3b4c146ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a23b16ba3274961494f5ad236345d238364349ff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c17fb542dbd1db745c9feac15617056506dd7195"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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