{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31718",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31718"
  ],
  "published": "2026-05-01T13:56:32Z",
  "summary": "ksmbd: fix use-after-free in __ksmbd_close_fd() via durable scavenger",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in __ksmbd_close_fd() via durable scavenger\n\nWhen a durable file handle survives session disconnect (TCP close without\nSMB2_LOGOFF), session_fd_check() sets fp->conn = NULL to preserve the\nhandle for later reconnection. However, it did not clean up the byte-range\nlocks on fp->lock_list.\n\nLater, when the durable scavenger thread times out and calls\n__ksmbd_close_fd(NULL, fp), the lock cleanup loop did:\n\n    spin_lock(&fp->conn->llist_lock);\n\nThis caused a slab use-after-free because fp->conn was NULL and the\noriginal connection object had already been freed by\nksmbd_tcp_disconnect().\n\nThe root cause is asymmetric cleanup: lock entries (smb_lock->clist) were\nleft dangling on the freed conn->lock_list while fp->conn was nulled out.\n\nTo fix this issue properly, we need to handle the lifetime of\nsmb_lock->clist across three paths:\n - Safely skip clist deletion when list is empty and fp->conn is NULL.\n - Remove the lock from the old connection's lock_list in\n   session_fd_check()\n - Re-add the lock to the new connection's lock_list in\n   ksmbd_reopen_durable_fd().",
  "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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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31718"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0000a7780e0e446a28a273572f6ea8f7f582f694"
    },
    {
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      "url": "https://git.kernel.org/stable/c/e33c65f011980b4ad4abfd93585ec2079856368f"
    },
    {
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      "url": "https://git.kernel.org/stable/c/3d6682726c2d3a46d31dae88b8166786b09b03ad"
    },
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      "url": "https://git.kernel.org/stable/c/b34fc42cfe922e551f7a27d3ac3bb016e41d7dd9"
    },
    {
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      "url": "https://git.kernel.org/stable/c/235e32320a470fcd3998fb3774f2290a0eb302a1"
    }
  ],
  "database_specific": {
    "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": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - ksmbd is an in-kernel SMB server reachable over TCP/IP, and the vulnerable durable-handle and byte-range-lock paths are driven by SMB2 network requests.\nAC:L - The attacker can create the durable handle, add a lock, disconnect TCP without SMB2_LOGOFF, and wait for the durable scavenger; no race or condition outside attacker control is required.\nPR:N - The path requires an SMB session and tree connection, but ksmbd supports guest/anonymous sessions and guest shares, making a no-credential network attack a reasonable high-severity deployment scenario.\nUI:N - No victim interaction is required once the ksmbd service is exposed; the attacker sends SMB2 requests and closes the connection.\nS:U - The bug corrupts kernel/ksmbd state within the same security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - This is a kernel use-after-free involving dangling list entries tied to freed connection state, and such memory corruption can plausibly be shaped into kernel memory disclosure.\nI:H - The same UAF/list corruption can plausibly be leveraged for kernel memory corruption or control-flow impact, so high integrity impact is warranted.\nA:H - At minimum, triggering the scavenger cleanup can dereference freed or invalid connection/list state and crash the kernel."
    }
  }
}