{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-53146",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-53146"
  ],
  "published": "2024-12-24T11:29:52Z",
  "summary": "NFSD: Prevent a potential integer overflow",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Prevent a potential integer overflow\n\nIf the tag length is >= U32_MAX - 3 then the \"length + 4\" addition\ncan result in an integer overflow. Address this by splitting the\ndecoding into several steps so that decode_cb_compound4res() does\nnot have to perform arithmetic on the unsafe length value.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/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-2024-53146"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/745f7ce5a95e783ba62fe774325829466aec2aa8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/90adbae9dd158da8331d9fdd32077bd1af04f553"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3c5f545c9a1f8a1869246f6f3ae8c17289d6a841"
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      "url": "https://git.kernel.org/stable/c/842f1c27a1aef5367e535f9e85c8c3b06352151a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/de53c5305184ca1333b87e695d329d1502d694ce"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dde654cad08fdaac370febb161ec41eb58e9d2a2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/084f797dbc7e52209a4ab6dbc7f0109268754eb9"
    },
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      "url": "https://git.kernel.org/stable/c/ccd3394f9a7200d6b088553bf38e688620cd27af"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7f33b92e5b18e904a481e6e208486da43e4dc841"
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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": 9.1,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The vulnerable parser is in nfsd's NFSv4 callback client (fs/nfsd/nfs4callback.c), decoding a CB_COMPOUND4res reply received over TCP from a remote NFS peer. A malicious NFS client controls every byte of that reply, either via its v4.1+ backchannel or via the v4.0 callback address it itself supplied in SETCLIENTID.\nAC:L - The attacker deterministically sets the tag length field to exactly 0xFFFFFFFC and elicits a callback on demand (async COPY\u2192CB_OFFLOAD, blocking LOCK\u2192CB_NOTIFY_LOCK, or delegation conflict\u2192CB_RECALL); no race and no memory-grooming is required. The attempt can be repeated indefinitely, and each callback re-allocates the reply buffer at a different slab address, sweeping different +4 GiB targets until one faults.\nPR:N - In the standard sec=sys deployment NFS performs no cryptographic authentication \u2014 the client merely asserts a uid \u2014 so any host permitted by the export (commonly a whole subnet, VPC, or a wildcard) reaches this code with no verified credentials. EXCHANGE_ID/CREATE_SESSION require no export access at all, and the vulnerable decode runs before any CB_SEQUENCE session validation.\nUI:N - The attacker drives both halves of the exchange itself: it triggers the callback with its own ordinary NFS operations and then sends the malformed reply. No action by an administrator or any other client is needed.\nS:U - The out-of-bounds read and the resulting fault are confined to the kernel's own memory and the rpciod worker context, all within a single security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The dereference lands roughly 4 GiB away from the slab-allocated receive buffer, reading kernel memory entirely unrelated to the RPC object \u2014 this is a wild read, not one strictly bounded to a few bytes past its object. When the target is unmapped the resulting oops dumps registers, kernel addresses, and a stack trace to the log, defeating KASLR.\nI:N - The bug is purely a read; the only write is `hdr->nops`, an in-bounds store to a stack-local struct that every caller leaves unused. No kernel structure is corrupted and the attacker gains no write primitive or control-flow influence.\nA:H - A 4 GiB displacement into the direct map frequently hits an unmapped hole, faulting on a kernel address inside the rpciod workqueue \u2014 a panic under panic_on_oops, otherwise a dead RPC worker that wedges the callback machinery and leaks RPC state. The remote attacker can repeat this at will until it crashes."
    }
  }
}