{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50283",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-50283"
  ],
  "published": "2024-11-19T01:35:04Z",
  "summary": "ksmbd: fix slab-use-after-free in smb3_preauth_hash_rsp",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix slab-use-after-free in smb3_preauth_hash_rsp\n\nksmbd_user_session_put should be called under smb3_preauth_hash_rsp().\nIt will avoid freeing session before calling smb3_preauth_hash_rsp().",
  "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-2024-50283"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cb645064e0811053c94e86677f2e58ed29359d62"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f7557bbca40d4ca8bb1c6c940ac6c95078bd0827"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c6cdc08c25a868a08068dfc319fa9fce982b8e7f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1b6ad475d4ed577d34e0157eb507be00c588bf5c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b8fc56fbca7482c1e5c0e3351c6ae78982e25ada"
    }
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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 - The bug is in ksmbd, the in-kernel SMB server, and is reached purely by sending SMB2 NEGOTIATE/SESSION_SETUP packets to TCP port 445 (or SMB-Direct/RDMA). No local access is required.\nAC:L - The attacker controls both sides of the race \u2014 one pipelined SESSION_SETUP is made to fail (marking the session EXPIRED and dropping refcnt to 0 at the premature put), while a second concurrent SESSION_SETUP on the same connection invokes ksmbd_expire_session() to free it, with requests served in parallel by ksmbd-io kworkers. Attempts are cheap and unlimited since no authentication or delay gates the path.\nPR:N - The entire path is pre-authentication: ksmbd_smb2_session_create() runs on a SESSION_SETUP with SessionId==0 before any credential check, and the failing setup can be triggered by a malformed negotiate blob (-EINVAL) with no valid user. No SMB credentials or local account are needed.\nUI:N - Exploitation requires only that the target has ksmbd running and reachable; the attacker sends all traffic itself with no victim action involved.\nS:U - The freed object, the corrupting write, and the impact all reside within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a slab use-after-free on struct ksmbd_session, and after heap reclaim smb3_preauth_hash_rsp() reads the attacker-supplied Preauth_HashValue pointer and feeds 64 bytes from that address into SHA-512, yielding a controlled kernel-memory read primitive on top of the freed-object disclosure.\nI:H - crypto_shash_final() writes a 64-byte SHA-512 digest through the attacker-controlled Preauth_HashValue pointer taken from the reclaimed session object, giving a remote arbitrary kernel write suitable for control-flow hijacking; the UAF itself also enables standard heap-spray exploitation.\nA:H - The use-after-free reliably produces a KASAN slab-use-after-free / oops, and the write through a bogus pointer read from freed memory panics the kernel, taking down the whole system remotely and repeatably."
    }
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}