{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98173",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-98173"
  ],
  "published": "2026-10-06T08:47:10Z",
  "summary": "smb: client: fix use-after-free of iface in cifs_try_adding_channels()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix use-after-free of iface in cifs_try_adding_channels()\n\ncifs_try_adding_channels() iterates ses->iface_list with\nlist_for_each_entry_safe_from(), which captures the next entry\n(niface) under iface_lock.  The loop body then drops iface_lock for\nthe whole duration of cifs_ses_add_channel().\n\nA concurrent interface refresh (SMB3_request_interfaces() ->\nparse_server_interfaces()) marks all ifaces inactive and removes and\nfrees any that are not re-advertised via list_del() + kref_put(),\nwhere release_iface() is a bare kfree().  Since niface typically has\nno channel holding a reference, the list reference is its last and it\ncan be freed inside the unlocked window.  On continue, the iterator\nadvance step then dereferences niface->iface_head.next, and the loop\nbody reads iface->rdma_capable/is_active, both on freed memory.\n\nFix this by never keeping an unreferenced list pointer across the\nunlocked window.  Each channel attempt now re-scans the list from the\nhead under iface_lock, takes a kref on the selected candidate, and\npasses only that referenced candidate to cifs_ses_add_channel().\nweight_fulfilled still tracks selection progress, so restarting the\nscan preserves the original weighted distribution and the\nweight_fulfilled-before-kref_put ordering on the failure path.\n\nAdd a per-pass attempts cap so a flapping interface refresh cannot\nkeep the inner loop spinning within a single tries increment.",
  "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-2026-98173"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c941f1ebfd26f683de81091473f3596a218abff0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e99040e5e9c60441e6b4725e1a7b88c3106ae903"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ec36b38e65596950e6c29bed7dfc90b98707c19c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d034e836eefd7ce75e588f7031cffbeec594f5ac"
    }
  ],
  "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 - A malicious SMB server sends the bad data over TCP/445 in its FSCTL_QUERY_NETWORK_INTERFACE_INFO responses. A later response leaves out an interface, so parse_server_interfaces() does list_del() and kref_put() and frees it. cifs_try_adding_channels() still holds niface after dropping iface_lock for cifs_ses_add_channel(), and that pointer now refers to freed memory.\nAC:H - Multichannel is off by default (multichannel=false, max_channels=1), so the victim must mount with multichannel or max_channels>1. The server also has to line up a refresh from the 600s smb2_query_server_interfaces worker with the unlocked add-channel window. It can stall channel setup and force reconnects to retry, but it does not schedule the worker.\nPR:N - The attacker only runs a rogue SMB server and needs no account or privilege on the victim client. The interface list is server-supplied data the client trusts during the session it opened.\nUI:R - A victim or admin has to mount a share from the attacker's server with multichannel turned on. CIFS mounts are not FS_USERNS_MOUNT, so the attacker cannot set up the client side alone.\nS:U - The memory corruption stays inside the client kernel's own security authority. No VM or other trust boundary is crossed.\nC:H - The loop continues through freed niface->iface_head.next and reads iface->rdma_capable, is_active, speed and sockaddr from the freed cifs_server_iface. The attacker can refill that heap object with their own data, which lets the kernel follow attacker-chosen pointers.\nI:H - Once the freed entry is reallocated, the loop does kref_get() and weight_fulfilled++/num_channels++ through the stale or forged iface pointer. That is a kernel write at a location the attacker influences, and cifs_ses_add_channel() then uses the forged object.\nA:H - Dereferencing the freed list entry in cifs_try_adding_channels() can oops or panic the client. The server can force reconnects to re-enter this path repeatedly."
    }
  }
}