{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53391",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53391"
  ],
  "published": "2026-07-19T12:02:32Z",
  "summary": "NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr\n\nnfs4_decode_mp_ds_addr() decodes the r_netid and r_addr opaques of a\nnetaddr4 from a GETDEVICEINFO multipath-DS body, then immediately\ncalls strrchr(buf, '.') to locate the port separator. Both decodes\nuse xdr_stream_decode_string_dup(), and the current code checks only\n\"nlen < 0\" / \"rlen < 0\" before dereferencing the returned string.\n\nWhen the on-wire opaque has length zero, xdr_stream_decode_opaque_inline()\nreturns 0 and xdr_stream_decode_string_dup() falls through to its\n\"*str = NULL; return ret\" tail, leaving buf NULL with a return value\nof 0. The \"< 0\" check does not catch this, and the next line is\nstrrchr(NULL, '.'), a kernel NULL pointer dereference reachable from\nany pNFS-flexfile client mounted against a malicious or compromised\nmetadata server.\n\nReject the zero-length cases explicitly so the decoder fails with\n-EBADMSG (treated as a malformed GETDEVICEINFO body) instead of\npanicking the client.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/41fe0f7b84f0cb822ae10ab08592996a592b2a25"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The crash is triggered by processing a malicious GETDEVICEINFO RPC response from an NFS metadata server over the network, on the standard NFSv4 client path used by pNFS file and flexfile layouts.\nAC:L - Once a victim is a pNFS client, the attacker reliably triggers the bug by sending a GETDEVICEINFO body with a zero-length r_netid or r_addr opaque; no race or special memory layout is required.\nPR:N - The attacker acts as (or compromises) the remote NFS metadata server and needs no local privileges on the victim client; exploitation is delivered entirely through NFS protocol responses to an already-established mount.\nUI:N - In the highest-impact scenario\u2014a compromised enterprise/HPC metadata server or autofs-managed pNFS mount\u2014no further victim action is needed beyond normal file I/O that provokes GETDEVICEINFO.\nS:U - The vulnerability causes a kernel panic on the NFS client itself and does not cross a security boundary such as a VM escape or sandbox breakout.\nC:N - This is a NULL pointer dereference in strrchr() with no out-of-bounds read or use-after-free; it does not disclose kernel memory or attacker-controlled data.\nI:N - There is no memory corruption, arbitrary write, or control-flow hijack primitive\u2014only an immediate NULL dereference that terminates kernel execution.\nA:H - The NULL pointer dereference in kernel context causes an oops or panic, fully denying availability of the affected client (and any co-hosted workloads until reboot)."
    }
  }
}