{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64396",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64396"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "ksmbd: fix UAF of struct file_lock in SMB2_LOCK deferred-lock cancellation",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix UAF of struct file_lock in SMB2_LOCK deferred-lock cancellation\n\nWhen a blocking byte-range lock request is deferred in the\nFILE_LOCK_DEFERRED path, ksmbd registers the asynchronous work into\nthe connection's async_requests list via setup_async_work(). The cancel\ncallback smb2_remove_blocked_lock() holds a reference to the flock.\n\nIf the lock waiter is subsequently woken up but the work state is no\nlonger KSMBD_WORK_ACTIVE (e.g., due to a concurrent cancellation), the\ncleanup path calls locks_free_lock(flock) without dequeuing the work from\nthe async_requests list. Concurrently, smb2_cancel() walks the list\nunder conn->request_lock and invokes the cancel callback, which then\ndereferences the already freed 'flock'. This leads to a slab-use-after-free\ninside __wake_up_common.\n\nFix this by restructuring the cleanup logic after the worker returns\nfrom ksmbd_vfs_posix_lock_wait(). Move list_del(&smb_lock->llist) and\nrelease_async_work(work) to the top of the cleanup block. This guarantees\nthat the async work is completely dequeued and serialized under\nconn->request_lock before locks_free_lock(flock) is called, rendering\nthe flock unreachable for any concurrent smb2_cancel().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - ksmbd accepts remote SMB traffic over TCP port 445, and SMB2 LOCK, CLOSE, and CANCEL requests reach the vulnerable code through the network handler.\nAC:L - The attacker can create both conflicting file handles, obtain the deferred request's AsyncId, and control the CLOSE/CANCEL sequencing, so both sides of the race are attacker-controlled.\nPR:L - SMB2 LOCK requires a valid SMB session, tree connection, and session-owned open file handle. Any ordinary authenticated share user suffices; administrative privileges are unnecessary.\nUI:N - The attacker can create the handles, conflicting locks, and cancellation requests without any victim action.\nS:U - The UAF occurs within the host kernel's ksmbd security authority and does not inherently cross a separate virtualization or sandbox boundary.\nC:H - The file_lock UAF permits attacker-influenced slab reuse and stale kernel-pointer dereferences, making kernel memory disclosure defensible.\nI:H - The stale callback performs list deletion and wait-queue operations through freed or reallocated fields, enabling kernel heap corruption, arbitrary-write primitives, and potential code execution.\nA:H - The UAF reaches __locks_delete_block or __wake_up_common and can cause a kernel oops or panic; a remote attacker can repeatedly retrigger it."
    }
  }
}