{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-56627",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-56627"
  ],
  "published": "2024-12-27T14:59:59Z",
  "summary": "ksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix Out-of-Bounds Read in ksmbd_vfs_stream_read\n\nAn offset from client could be a negative value, It could lead\nto an out-of-bounds read from the stream_buf.\nNote that this issue is coming when setting\n'vfs objects = streams_xattr parameter' in ksmbd.conf.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
    }
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-56627"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6bd1bf0e8c42f10a9a9679a4c103a9032d30594d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/de4d790dcf53be41736239d7ee63849a16ff5d10"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/27de4295522e9a33e4a3fc72f7b8193df9eebe41"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/81eed631935f2c52cdaf6691c6d48e0b06e8ad73"
    },
    {
      "type": "FIX",
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  "database_specific": {
    "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": 8.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - ksmbd is the in-kernel SMB server listening on TCP/445; the malicious `Offset` field arrives in an SMB2 READ request from a remote peer over the network. No local access to the target is needed.\nAC:L - The attacker fully and deterministically controls both the negative offset and the read length, and creates all preconditions itself (open `file:stream`, write one byte, then read at a negative offset); no race, no memory-layout luck, and no condition outside the attacker's control is required.\nPR:L - `smb2_check_user_session()` requires an established SMB2 session and tree connect before SMB2_READ is dispatched, so the attacker needs credentials for the share (or a guest-ok share), i.e. the privileges of an ordinary SMB user.\nUI:N - The entire sequence (CREATE with a stream name, WRITE, READ with negative offset) is driven by the attacker's own SMB connection; no administrator or user on the target has to do anything.\nS:U - The out-of-bounds read and its disclosure occur wholly within the kernel's security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The attacker-controlled 64-bit negative displacement turns `memcpy(buf, &stream_buf[*pos], count)` into an effectively arbitrary kernel-memory read of up to 4 MB per request, and the bytes are returned directly to the remote client in the READ response \u2014 disclosing kernel pointers, credentials, keys, and other users' cached file data, repeatably.\nI:N - The defect is purely a read; the destination `aux_payload_buf` is `kvzalloc(length)` with `count <= length`, so no kernel memory is written or corrupted by this bug.\nA:H - A large negative offset makes the kernel `memcpy` from an unmapped or invalid address, producing an unhandled kernel page fault/oops that kills the ksmbd worker thread and panics the box on `panic_on_oops` configurations; it can be retriggered at will."
    }
  }
}