{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64141",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64141"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "ksmbd: fix null pointer dereference in compare_guid_key()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix null pointer dereference in compare_guid_key()\n\nsession_fd_check() walks the per-inode m_op_list during durable-handle\nsession teardown and sets op->conn = NULL for every opinfo whose conn\nmatched the closing session's connection. The matching opinfo, however,\nstays linked in its per-ClientGuid lease_table_list entry's lb->lease_list\nbecause destroy_lease_table() only runs on full TCP-connection teardown,\nnot on SESSION_LOGOFF.\n\nIf the same TCP connection then negotiates a fresh session with the\nsame ClientGuid (ClientGuid is bound to NEGOTIATE, not the session, and\nis unchanged across LOGOFF + SETUP) and issues a SMB2 CREATE with a\nlease context on a different inode, find_same_lease_key() walks\nlb->lease_list, reaches the stale opinfo, and calls compare_guid_key(),\nwhich unconditionally dereferences opinfo->conn->ClientGUID. The conn\npointer is NULL and the kernel panics.\n\nReproducer requires only a successful SMB2 SESSION_SETUP and a share\nconfigured with 'durable handles = yes'. KASAN report on mainline\n70390501d194:\n\n  general protection fault, probably for non-canonical address\n  0xdffffc0000000069: 0000 [#1] SMP KASAN PTI\n  KASAN: null-ptr-deref in range [0x0000000000000348-0x000000000000034f]\n  Workqueue: ksmbd-io handle_ksmbd_work\n  RIP: 0010:bcmp+0x5b/0x230\n  Call Trace:\n   compare_guid_key+0x4b/0xd0\n   find_same_lease_key+0x324/0x690\n   smb2_open+0x6aea/0x8e60\n   handle_ksmbd_work+0x796/0xee0\n   ...\n\nFaulting address 0x348 is the offset of ClientGUID within struct\nksmbd_conn, confirming opinfo->conn was NULL.\n\nRead opinfo->conn once and bail out if it has been cleared by a\nconcurrent session_fd_check(). A half-detached opinfo cannot be the\nowner of an active lease, so returning 0 is the correct match result.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64141"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e43cb36d4d7827710cfcd48e95e29a507f0d87be"
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      "url": "https://git.kernel.org/stable/c/0836081b394ca074d1b910f2b990ff7b4b4404c7"
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      "url": "https://git.kernel.org/stable/c/cd5c1b75d2f454f625d7dc55bd3ae21d0855f6ad"
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - ksmbd is an in-kernel SMB server on TCP/445; the crash is triggered by remote SMB2 packets processed in `handle_ksmbd_work()` without local access.\nAC:L - The attacker fully controls the deterministic sequence (durable CREATE with lease, SESSION_LOGOFF, SESSION_SETUP on the same TCP connection, CREATE with lease on another file); no race or timing dependency beyond attacker-driven requests.\nPR:N - Exploitation requires only network reachability to ksmbd and completion of SMB2 SESSION_SETUP (including guest/anonymous where permitted); no prior Linux OS privileges or capabilities are needed on the host.\nUI:N - No victim user action is required beyond the attacker sending crafted SMB2 protocol messages to the server.\nS:U - Impact is a kernel oops/panic within the ksmbd server context; it does not cross a security boundary such as guest-to-host escape or sandbox breakout.\nC:N - The fault is a NULL pointer dereference in `bcmp()` at offset 0x348 into `struct ksmbd_conn`; the invalid read faults before any data is returned to the attacker.\nI:N - There is no memory corruption or write primitive\u2014only a read through a NULL `opinfo->conn` pointer that immediately triggers a kernel fault.\nA:H - A remotely triggerable NULL dereference in kernel workqueue context causes a general protection fault/kernel oops, enabling repeatable denial of service against the host."
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}