{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-68809",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-68809"
  ],
  "published": "2026-01-13T15:29:33Z",
  "summary": "ksmbd: vfs: fix race on m_flags in vfs_cache",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: vfs: fix race on m_flags in vfs_cache\n\nksmbd maintains delete-on-close and pending-delete state in\nksmbd_inode->m_flags. In vfs_cache.c this field is accessed under\ninconsistent locking: some paths read and modify m_flags under\nci->m_lock while others do so without taking the lock at all.\n\nExamples:\n\n - ksmbd_query_inode_status() and __ksmbd_inode_close() use\n   ci->m_lock when checking or updating m_flags.\n - ksmbd_inode_pending_delete(), ksmbd_set_inode_pending_delete(),\n   ksmbd_clear_inode_pending_delete() and ksmbd_fd_set_delete_on_close()\n   used to read and modify m_flags without ci->m_lock.\n\nThis creates a potential data race on m_flags when multiple threads\nopen, close and delete the same file concurrently. In the worst case\ndelete-on-close and pending-delete bits can be lost or observed in an\ninconsistent state, leading to confusing delete semantics (files that\nstay on disk after delete-on-close, or files that disappear while still\nin use).\n\nFix it by:\n\n - Making ksmbd_query_inode_status() look at m_flags under ci->m_lock\n   after dropping inode_hash_lock.\n - Adding ci->m_lock protection to all helpers that read or modify\n   m_flags (ksmbd_inode_pending_delete(), ksmbd_set_inode_pending_delete(),\n   ksmbd_clear_inode_pending_delete(), ksmbd_fd_set_delete_on_close()).\n - Keeping the existing ci->m_lock protection in __ksmbd_inode_close(),\n   and moving the actual unlink/xattr removal outside the lock.\n\nThis unifies the locking around m_flags and removes the data race while\npreserving the existing delete-on-close behaviour.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-68809"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5adad9727a815c26013b0d41cfee92ffa7d4037c"
    },
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      "url": "https://git.kernel.org/stable/c/ccc78781041589ea383e61d5d7a1e9a31b210b93"
    },
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      "url": "https://git.kernel.org/stable/c/ee63729760f5b61a66f345c54dc4c7514e62383d"
    },
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    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.1,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The race is reachable through ksmbd SMB2 requests received over TCP, normally port 445, including CREATE, SET_INFO, QUERY_INFO, and CLOSE operations.\nAC:L - An attacker can control both sides by opening multiple handles to the same inode and issuing concurrent requests or disconnects that ksmbd processes on separate workers.\nPR:N - Although a valid session, writable tree connection, and delete-capable handle are normally required, ksmbd supports unauthenticated guest sessions and guest-writable shares. Such deployments let a remote attacker reach the race without possessing credentials.\nUI:N - The attacker can create the necessary handles, race the requests, and trigger final close without any victim action.\nS:U - The affected SMB server, filesystem operations, and resulting data impact remain within the host kernel's security authority.\nC:N - The raced field is an aligned unsigned flag word, and the affected operations neither expose data nor corrupt pointers, object lifetimes, or adjacent memory.\nI:H - Lost or stale pending-delete and delete-on-close bits can cause attacker-selected files, directories, or alternate data streams to be unlinked despite the intended state, producing persistent data loss in a critical writable share.\nA:H - Unexpected and repeatable deletion of operational files while they are in use can persistently make shared storage or dependent services unavailable."
    }
  }
}