{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38220",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-38220"
  ],
  "published": "2025-07-04T13:42:19Z",
  "summary": "ext4: only dirty folios when data journaling regular files",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: only dirty folios when data journaling regular files\n\nfstest generic/388 occasionally reproduces a crash that looks as\nfollows:\n\nBUG: kernel NULL pointer dereference, address: 0000000000000000\n...\nCall Trace:\n <TASK>\n ext4_block_zero_page_range+0x30c/0x380 [ext4]\n ext4_truncate+0x436/0x440 [ext4]\n ext4_process_orphan+0x5d/0x110 [ext4]\n ext4_orphan_cleanup+0x124/0x4f0 [ext4]\n ext4_fill_super+0x262d/0x3110 [ext4]\n get_tree_bdev_flags+0x132/0x1d0\n vfs_get_tree+0x26/0xd0\n vfs_cmd_create+0x59/0xe0\n __do_sys_fsconfig+0x4ed/0x6b0\n do_syscall_64+0x82/0x170\n ...\n\nThis occurs when processing a symlink inode from the orphan list. The\npartial block zeroing code in the truncate path calls\next4_dirty_journalled_data() -> folio_mark_dirty(). The latter calls\nmapping->a_ops->dirty_folio(), but symlink inodes are not assigned an\na_ops vector in ext4, hence the crash.\n\nTo avoid this problem, update the ext4_dirty_journalled_data() helper to\nonly mark the folio dirty on regular files (for which a_ops is\nassigned). This also matches the journaling logic in the ext4_symlink()\ncreation path, where ext4_handle_dirty_metadata() is called directly.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38220"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cf6a4c4ac7b6e3214f25df594c9689a62f1bb456"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/be5f3061a6f904e3674257879e71881ceee5b673"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d7af6eee8cd60f55aa8c5fe2b91f11ec0c9a0f27"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e26268ff1dcae5662c1b96c35f18cfa6ab73d9de"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}