{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89636",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89636"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "smb: client: clear ce->tgthint in free_tgts()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: clear ce->tgthint in free_tgts()\n\nWhen free_tgts() frees all structures in ce->tlist, ce->tgthint\nis left pointing to one of the freed cache_dfs_tgt structures.\n\nIf ce->tgthint is not reset before it is used later, it results\nin a use-after-free.\n\nSet ce->tgthint to NULL in free_tgts() after the elements are\nfreed to reflect that no elements remain.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89636"
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/14f60e959b5ac813715ff72e127beb3584ddabf6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3ff9462bb7a06d8d32a1dc02d39580b078ec9e55"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7507bd1885643d0461a6017767492450af1ce2a3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9ab46a13798a61d9d020b01d4e57efdabe6624fa"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5baab40404a9393bcc0b7b8f1950bf2c307e0984"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b1b741cf8e7ce1b91d937e23decd3d3358748700"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The dangling ce->tgthint is created while handling FSCTL_DFS_GET_REFERRALS/TRANS2_GET_DFS_REFERRAL replies from a remote SMB server over TCP/445 (smb2_get_dfs_refer \u2192 cache_refresh_path \u2192 update_cache_entry_locked \u2192 free_tgts). A malicious, compromised, or MITM'd DFS server reaches this purely over the network.\nAC:L - A hostile DFS server controls referral TTL (down to CACHE_MIN_TTL), target lists, and TCP resets that drive dfs_cache_refresh and reconnect into update_cache_entry_locked; after free_tgts() the later get_tgt_name()/dfs_cache_noreq_update_tgthint() use is deterministic, and the attacker can size and retry referrals to leave the stale hint and reclaim the slab.\nPR:N - The attacker is the remote SMB/DFS peer (or a MITM on an unsigned session) and needs no account, capability, or local privileges on the victim; the client authenticates to that server, and the kernel DFS cache parses the reply regardless of which local user owns the mount.\nUI:N - Once a DFS CIFS mount exists (fstab, autofs/systemd automount, enterprise DFS, cifsroot), dfs_cache_refresh delayed work and reconnect-driven cifs_tree_connect()/dfs_cache_noreq_find() use the stale tgthint automatically after a server-induced refresh or TCP drop, with no further user action.\nS:U - The use-after-free is of kmalloc'd cache_dfs_tgt objects in the client kernel heap and remains in the same host kernel security authority; it does not cross a VM, IOMMU, or sandbox boundary.\nC:H - get_tgt_name() and dfs_cache_noreq_update_tgthint() dereference the freed cache_dfs_tgt (t->name). Reclaiming that slab with attacker-controlled SMB allocations yields an arbitrary kernel read via kstrdup/strcasecmp of a sprayed name pointer.\nI:H - Use-after-free of the heap cache_dfs_tgt enables heap spraying and overlapping live objects; the dangling hint is also copied into DFS referral state and used for failover tree-connect, giving a write/control-flow primitive once the object is reclaimed.\nA:H - Dereferencing the freed cache_dfs_tgt from reconnect (cifs_tree_connect \u2192 dfs_cache_noreq_find) or dfs_cache_find oopses or panics the client kernel, and a malicious server can retrigger it on every refresh or reconnect."
    }
  }
}