{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-58087",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-58087"
  ],
  "published": "2025-03-12T07:33:12Z",
  "summary": "ksmbd: fix racy issue from session lookup and expire",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix racy issue from session lookup and expire\n\nIncrement the session reference count within the lock for lookup to avoid\nracy issue with session expire.",
  "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-2024-58087"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2107ab40629aeabbec369cf34b8cf0f288c3eb1b"
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/37a0e2b362b3150317fb6e2139de67b1e29ae5ff"
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/450a844c045ff0895d41b05a1cbe8febd1acfcfd"
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    {
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      "url": "https://git.kernel.org/stable/c/a39e31e22a535d47b14656a7d6a893c7f6cf758c"
    },
    {
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      "url": "https://git.kernel.org/stable/c/b95629435b84b9ecc0c765995204a4d8a913ed52"
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - ksmbd is the in-kernel SMB server processing requests received on TCP port 445; every affected path (`smb2_sess_setup`, `smb2_check_user_session`, `smb3_decrypt_req`, `__handle_ksmbd_work`) is driven directly by attacker-supplied SMB2 PDUs from a remote peer.\nAC:L - The attacker controls both sides of the race \u2014 it pipelines up to 8192 concurrent requests per connection (each handled by a separate ksmbd-io kworker), drives sessions into EXPIRED/IN_PROGRESS state so `ksmbd_expire_session()` frees them with no timeout, and the `__handle_ksmbd_work` window spans an entire AES-GCM response encryption. A lost race yields only a benign SMB error, so it can be retried indefinitely.\nPR:N - Two of the three unreferenced lookups live inside `smb2_sess_setup()` \u2014 the authentication handshake itself \u2014 and operate on attacker-supplied, sequentially-allocated (trivially enumerable) session IDs before any credential is verified, including `ksmbd_session_lookup_slowpath()` against the global session table. Additionally, `ntlm_authenticate()` skips password verification entirely for guest/anonymous users, so under the common \"map to guest\" configuration an unauthenticated peer obtains a VALID session and reaches all remaining paths.\nUI:N - Exploitation requires only that the attacker send SMB2 requests to the listening ksmbd service; no action by any local user or administrator is involved.\nS:U - The use-after-free corrupts kernel heap memory within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed `struct ksmbd_session` is read after free, including `smb3encryptionkey`/`smb3decryptionkey`/`smb3signingkey` \u2014 `encrypt_resp()` encrypts responses using whatever now occupies that slab, leaking freed kernel memory to the wire; controlling the reallocated `sess->user` and `file_table` pointers escalates this to arbitrary kernel read.\nI:H - The bug yields multiple write primitives on freed memory \u2014 `atomic_inc/dec` on `sess->refcnt`, `sess->state = SMB2_SESSION_EXPIRED`, `sess->user = NULL`, and `kfree(sess->Preauth_HashValue)` plus xarray-walking frees in `ksmbd_session_destroy()` \u2014 giving arbitrary-free and controlled-pointer corruption suitable for control-flow hijack, and `sess->user` directly governs SMB access-control decisions.\nA:H - Any lost race dereferences freed slab memory, reliably producing a kernel oops or panic in the ksmbd worker, and the attacker can trigger it repeatedly from the network to take down the file server."
    }
  }
}