{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-49870",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-49870"
  ],
  "published": "2024-10-21T18:02:47Z",
  "summary": "cachefiles: fix dentry leak in cachefiles_open_file()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: fix dentry leak in cachefiles_open_file()\n\nA dentry leak may be caused when a lookup cookie and a cull are concurrent:\n\n            P1             |             P2\n-----------------------------------------------------------\ncachefiles_lookup_cookie\n  cachefiles_look_up_object\n    lookup_one_positive_unlocked\n     // get dentry\n                            cachefiles_cull\n                              inode->i_flags |= S_KERNEL_FILE;\n    cachefiles_open_file\n      cachefiles_mark_inode_in_use\n        __cachefiles_mark_inode_in_use\n          can_use = false\n          if (!(inode->i_flags & S_KERNEL_FILE))\n            can_use = true\n\t  return false\n        return false\n        // Returns an error but doesn't put dentry\n\nAfter that the following WARNING will be triggered when the backend folder\nis umounted:\n\n==================================================================\nBUG: Dentry 000000008ad87947{i=7a,n=Dx_1_1.img}  still in use (1) [unmount of ext4 sda]\nWARNING: CPU: 4 PID: 359261 at fs/dcache.c:1767 umount_check+0x5d/0x70\nCPU: 4 PID: 359261 Comm: umount Not tainted 6.6.0-dirty #25\nRIP: 0010:umount_check+0x5d/0x70\nCall Trace:\n <TASK>\n d_walk+0xda/0x2b0\n do_one_tree+0x20/0x40\n shrink_dcache_for_umount+0x2c/0x90\n generic_shutdown_super+0x20/0x160\n kill_block_super+0x1a/0x40\n ext4_kill_sb+0x22/0x40\n deactivate_locked_super+0x35/0x80\n cleanup_mnt+0x104/0x160\n==================================================================\n\nWhether cachefiles_open_file() returns true or false, the reference count\nobtained by lookup_positive_unlocked() in cachefiles_look_up_object()\nshould be released.\n\nTherefore release that reference count in cachefiles_look_up_object() to\nfix the above issue and simplify the code.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-49870"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d32ff64c872d7e08e893c32ba6a2374583444410"
    },
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      "url": "https://git.kernel.org/stable/c/c7d10fa7d7691558ff967668494672415f5fa151"
    },
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      "url": "https://git.kernel.org/stable/c/e4a28489b310339b2b8187bec0a437709be551c1"
    },
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      "url": "https://git.kernel.org/stable/c/7fa2382f97421978514a419c93054eca69f5247b"
    },
    {
      "type": "FIX",
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    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
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}