{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98175",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-98175"
  ],
  "published": "2026-10-06T08:47:10Z",
  "summary": "smb: client: cancel reconnect work in clean_demultiplex_info()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: cancel reconnect work in clean_demultiplex_info()\n\nclean_demultiplex_info() cancels server->echo delayed work but not\nserver->reconnect, which can cause a use-after-free when the\ndemultiplex thread exits while a reconnect work is still queued:\n\n  cifs_demultiplex_thread()\n    cifs_readv_from_socket()\n      cifs_reconnect()\n        __cifs_reconnect()\n          cifs_queue_server_reconn()\n            mod_delayed_work(cifsiod_wq, &server->reconnect, 0)\n    clean_demultiplex_info()\n      cancel_delayed_work_sync(&server->echo)   // echo canceled\n                                                 // reconnect NOT canceled\n      kfree_sensitive(server)                    // server freed\n\n  ...later, on cifsiod_wq:\n\n  smb2_reconnect_server()\n    server->srv_count  // UAF read of freed server\n\nFix this by canceling server->reconnect delayed work in\nclean_demultiplex_info() before the server is freed, the same way\ncifs_put_tcp_session() already does.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98175"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/180380272f116dbd2b0354c5c7872e112e519149"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e3f6a779433d13aafb5edab59e4f9313051e8a52"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7ab9ceedd860216fb97f2d8574cbe58b8906f42a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2e5103e11a17c274715dd56cf185eeedccf686b8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c65eae6f61d1778ff7a82e4aae4080e26f486af1"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-07T06:50:27Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The SMB server at the other end of the client's TCP connection triggers the bug. When it resets the connection or sends an oversized SMB response, cifs_demultiplex_thread() calls cifs_reconnect() and then __cifs_reconnect(), which queues server->reconnect via cifs_queue_server_reconn(). clean_demultiplex_info() then frees the server without cancelling that work.\nAC:H - The malicious server can force reconnects whenever it likes. The free, though, only happens when the client drops its last TCP session reference (umount or a session put, via cifs_put_tcp_session) inside the window where __cifs_reconnect has re-queued the reconnect work. Then smb2_reconnect_server must run after kfree(server). The server cannot produce that client-side timing on demand.\nPR:N - A remote SMB server needs no credentials on the client host to drop its own connection or send a malformed response that drives the client into __cifs_reconnect. Mounting locally is not a lower-privilege route: cifs_fs_type has no FS_USERNS_MOUNT, so a local attacker would need real CAP_SYS_ADMIN.\nUI:R - The client has to mount a share from the attacker's SMB server, and a demultiplex thread only exists after that mount. The free also needs the client to unmount or otherwise drop the session at the wrong moment.\nS:U - The freed struct TCP_Server_Info and the cifsiod_wq worker that uses it after free are both in the client kernel. No VM, IOMMU or sandbox boundary is crossed.\nC:H - smb2_reconnect_server() reads server->srv_count from the freed TCP_Server_Info. If a reallocated object puts a nonzero value there, the worker carries on and dereferences primary_server, the reconnect_mutex and the session lists, all of which a heap spray would control.\nI:H - With a nonzero srv_count in reclaimed memory, the worker increments it, takes reconnect_mutex, manipulates the ses and tcon lists and calls cifs_put_tcp_session on the stale pointer. Those are writes through attacker-shaped memory, so they can corrupt kernel data.\nA:H - syzbot reproduced this use-after-free of TCP_Server_Info in smb2_reconnect_server. A stale worker running on the shared cifsiod_wq workqueue can oops or panic the client kernel."
    }
  }
}