{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64401",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64401"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "smb: client: resolve SWN tcon from live registrations",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: resolve SWN tcon from live registrations\n\ncifs_swn_notify() looks up a witness registration by id under\ncifs_swnreg_idr_mutex, drops the mutex, and then uses the registration's\ncached tcon pointer.  That pointer is not a lifetime reference, and it is\nnot a stable representative once cifs_get_swn_reg() lets multiple tcons\nfor the same net/share name share one registration id.\n\nA same-share second mount can keep the cifs_swn_reg alive after the first\ntcon unregisters and is freed.  The registration then still points at the\nfreed first tcon, so taking tc_lock or incrementing tc_count through\nswnreg->tcon only moves the use-after-free earlier.  Taking tc_lock while\nholding cifs_swnreg_idr_mutex also violates the documented CIFS lock\norder.\n\nFix this by making the registration store only the stable witness\nidentity: id, net name, share name, and notify flags.  When a notify\narrives, copy that identity under cifs_swnreg_idr_mutex, drop the mutex,\nthen find and pin a live witness tcon that currently matches the net/share\npair under the normal cifs_tcp_ses_lock -> tc_lock order.  The notification\npath uses that pinned tcon directly and drops the reference when done.\n\nRegistration and unregister messages now use the live tcon passed by the\ncaller instead of a cached tcon in the registration.  The final unregister\nsend is folded into cifs_swn_unregister() while the registration is still\nprotected by cifs_swnreg_idr_mutex.  This removes the previous\nfind/drop/reacquire raw-pointer window.  The release path only removes the\nidr entry and frees the stable identity strings.\n\nThis preserves the intended one-registration/many-tcon behavior: a\nregistration id represents a net/share pair, and notify handling acts on a\nlive representative selected at use time.  It also preserves CLIENT_MOVE\nordering for the representative tcon because the old-IP unregister is sent\nbefore cifs_swn_register() sends the new-IP register.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64401"
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/51d18db392e5386a7bb9e816d611f14e600cca3c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/aa3c0cab4b28c5007ec570c63e1d6ad6943ed0fd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/945b4a4a54497db1dcb2f20ef801a84e884dac21"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/91b8a58c6ac15c7db6518f696389933282f88da7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0700f946659d0ab2352ec8a9b1c6fc74b13a27d7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ec457f9afe5ae9538bdcd58fd4cb442b9787e183"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The UAF is locally reachable through the world-readable /proc/fs/cifs/DebugData path and, on earlier affected kernels, unrestricted SWN generic-netlink notifications.\nAC:L - A same-share second mount deterministically preserves the registration after the first tcon is freed; repeated proc reads or notifications then dereference the stale pointer without requiring an uncontrollable race.\nPR:L - An unprivileged local user can read /proc/fs/cifs/DebugData, and affected kernels predating the companion netlink authorization fix also allowed unprivileged SWN_NOTIFY messages. User namespaces do not grant CIFS mount authority, but no mount privilege is needed once normal mount turnover creates the stale registration.\nUI:N - Once a witness-enabled registration exists, exploitation requires no further victim action; the attacker can invoke the local trigger directly.\nS:U - Successful exploitation compromises the host kernel within the same security authority and does not inherently cross a VM, IOMMU, or other scope boundary.\nC:H - The heap UAF involves attacker-reclaimable cifs_tcon and cifs_swn_reg objects whose pointer chains reach session credentials and arbitrary kernel memory, enabling high-impact disclosure primitives.\nI:H - Reclaiming the freed objects can redirect client-move and reconnect operations through attacker-influenced pointers, providing arbitrary-write and control-flow-hijacking potential.\nA:H - Dereferencing the freed tcon or registration can cause an immediate kernel oops or panic, and the periodic echo worker can repeatedly exercise the stale pointer."
    }
  }
}