{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72381",
  "modified": "2026-10-07T14:35:31Z",
  "upstream": [
    "CVE-2026-72381"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "ksmbd: fix use-after-free of fp->owner.name in durable handle owner check",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free of fp->owner.name in durable handle owner check\n\nTwo concurrent SMB2 durable reconnects (DH2C/DHnC) on the same\npersistent_id race the fp->owner.name compare-read in\nksmbd_vfs_compare_durable_owner() against the kfree() in\nksmbd_reopen_durable_fd()'s reopen-success path. fp->owner.name is a\nstandalone kstrdup() buffer whose lifetime is independent of the fp\nrefcount, and the two sites share no lock: the compare reads the buffer\nwhile the reopen frees it, so the strcmp() can dereference freed memory.\n\nCommit 7ce4fc40018d (\"ksmbd: fix durable reconnect double-bind race in\nksmbd_reopen_durable_fd\") made the fp->conn claim atomic under\nglobal_ft.lock (closing the owner.name double-free and the ksmbd_file\nwrite-UAF), but the compare-read versus reopen-free pair was left\nunserialized.\n\n  BUG: KASAN: slab-use-after-free in strcmp+0x2c/0x80\n  Read of size 1 by task kworker\n    strcmp\n    ksmbd_vfs_compare_durable_owner\n    smb2_check_durable_oplock\n    smb2_open\n  Freed by task kworker:\n    kfree\n    ksmbd_reopen_durable_fd\n    smb2_open\n  Allocated by task kworker:\n    kstrdup\n    session_fd_check\n    smb2_session_logoff\n  The buggy address belongs to the cache kmalloc-8\n\nSerialize both sides of the race with fp->f_lock.  The global durable\nfile-table lock still protects the durable reconnect claim, but\nfp->owner.name is per-open state and does not need to block unrelated\ndurable table lookups or reconnects.  The teardown is left at its\nexisting location after the reopen-success point so that an __open_id()\nrollback still retains owner.name for a later legitimate reconnect to\nverify.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.12.93-1+rpt1",
        "1:6.12.96-1+rpt1"
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          },
          {
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            "binary_version": "1:6.12.93-1+rpt1"
          },
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            "linux_commit": "d8ab4e908235da7727f22dd36ad5af224671677d",
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.97"
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            "upstream_fixed": "6.12.97"
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    },
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        "name": "linux"
      },
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        "1:6.18.33-1+rpt1",
        "1:6.18.34-1+rpt1",
        "1:6.18.39-1+rpt1"
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72381"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fb978d72052704c6b06c6b0f129fcd60b77169f5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/93d4d46bf9d442a12ea87278049ec416962c627f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5a5ac2852cd326529d02f778bc1aa6184701f4d7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ed98719be41389d416953b8ef9f07a07dfea6b2b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/38637163501fd9e2f684b8cd275d0db5d79f37c6"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z"
  }
}