{
  "cveId": "CVE-2026-64108",
  "url": "https://patchblox.com/security/cve/CVE-2026-64108",
  "summary": "CVE-2026-64108 is fixed in 56 products on 1 platform, first by ALAS2023-2026-1882, released June 22, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  cifs: Fix busy dentry used after unmounting  Sin...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  cifs: Fix busy dentry used after unmounting  Since commit 340cea84f691c (\u0022cifs: open files should not hold ref on superblock\u0022), cifs file only holds the dentry ref_cnt, the cifs file close work(cfile-\u003Edeferred) could be executed after unmounting, which will trigger a warning in generic_shutdown_super:  BUG: Dentry 00000000a14a6845{i=c,n=file}  still in use (1) [unmount of  cifs cifs]  The detailed processs is:    process A           process B           kworker  fd = open(PATH)   vfs_open    file-\u003E__f_path = *path // dentry-\u003Ed_lockref.count = 1    cifs_open     cifs_new_fileinfo      cfile-\u003Edentry = dget(dentry) // dentry-\u003Ed_lockref.count = 2  close(fd)   __fput   cifs_close    queue_delayed_work(deferredclose_wq, cfile-\u003Edeferred)   dput(dentry) // dentry-\u003Ed_lockref.count = 1 \t\t\t                 smb2_deferred_work_close \t\t\t\t\t  _cifsFileInfo_put \t\t\t\t\t   list_del(\u0026cifs_file-\u003Eflist)                     umount \t\t     cleanup_mnt \t\t      deactivate_super \t\t       cifs_kill_sb \t\t        cifs_close_all_deferred_files_sb \t\t\t cifs_close_all_deferred_files \t\t\t  // cannot find cfile, skip _cifsFileInfo_put \t\t\tkill_anon_super \t\t\t generic_shutdown_super \t\t\t  shrink_dcache_for_umount \t\t\t   umount_check \t\t\t    WARN ! // dentry-\u003Ed_lockref.count = 1 \t\t\t\t\t   cifsFileInfo_put_final \t\t\t\t\t    dput(cifs_file-\u003Edentry) \t\t                            // dentry-\u003Ed_lockref.count = 0  Fix it by flushing \u0027deferredclose_wq\u0027 before calling kill_anon_super.  Fetch a reproducer in https://bugzilla.kernel.org/show_bug.cgi?id=221548.",
  "published": "2026-06-22T09:00:00Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00129,
  "epssPercentile": 0.02581,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}