{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38437",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38437"
  ],
  "published": "2025-07-25T15:35:02Z",
  "summary": "ksmbd: fix potential use-after-free in oplock/lease break ack",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix potential use-after-free in oplock/lease break ack\n\nIf ksmbd_iov_pin_rsp return error, use-after-free can happen by\naccessing opinfo->state and opinfo_put and ksmbd_fd_put could\ncalled twice.",
  "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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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38437"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e38ec88a2b42c494601b1213816d75f0b54d9bf0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/97c355989928a5f60b228ef5266c1be67a46cdf9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/815f1161d6dbc4c54ccf94b7d3fdeab34b4d7477"
    },
    {
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      "url": "https://git.kernel.org/stable/c/8106adc21a2270c16abf69cd74ccd7c79c6e7acd"
    },
    {
      "type": "FIX",
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The vulnerable code is the ksmbd in-kernel SMB server's SMB2_OPLOCK_BREAK handler (fs/smb/server/smb2pdu.c), reached directly from an SMB2 PDU received on TCP/445. No local access is required.\nAC:L - The attacker fully controls both sides of the sequence \u2014 granting the oplock/lease, triggering the break from a second connection, and sending the ack \u2014 and can drive the only remaining condition (a `krealloc` failure under `__GFP_RETRY_MAYFAIL`, which fails instead of OOM-killing) by compounding many acks to force repeated iov growth while exhausting kernel memory with concurrent connections and large buffers.\nPR:L - `smb2_check_user_session()` rejects SMB2_OPLOCK_BREAK without a valid session, and the path needs a tree connect plus an open handle holding an oplock or lease, so a basic authenticated share user (or a guest account where the share permits it) is required.\nUI:N - The attacker performs every step \u2014 file open, conflicting open to force the break, and the oplock/lease break ack \u2014 with no action by any legitimate user or administrator.\nS:U - The corruption and its impact are confined to the kernel's own memory and the ksmbd server's security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The refcount underflow frees a still-linked `struct oplock_info` and an extra reference on `struct ksmbd_conn`/`struct ksmbd_file`, so subsequent dereferences of `opinfo->conn`, `->sess`, `->o_fp` and the waitqueue lists read heap the attacker can groom, yielding kernel memory disclosure.\nI:H - The freed object contains two list_heads and two wait_queue_heads still referenced by `fp->f_opinfo`, `ci->m_op_list` and the lease table; reallocating it lets `wake_up_interruptible_all()` invoke an attacker-supplied `wait_queue_entry->func` pointer and lets list unlink act as a write-what-where, giving arbitrary write and code execution.\nA:H - Even without successful exploitation the use-after-free, refcount underflow, and premature `__ksmbd_close_fd()`/connection release reliably produce oops or panic, and the attack can be repeated to keep the server down."
    }
  }
}