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GHSA-FPGC-GPFG-74F9

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo

nfsd4_ff_encode_getdeviceinfo() computes the da_addr_body reservation as 16 + netid_len + addr_len, but the subsequent xdr_encode_opaque() calls emit 8 + round_up(netid_len, 4) + round_up(addr_len, 4) bytes. The mismatch means the declared da_addr_body length exceeds the actual encoded data by 2-8 bytes on every flexfile GETDEVICEINFO reply, leaking stale reply-page content to the client and mis-aligning the subsequent version list decode.

Use xdr_align_size() for each string length to match what xdr_encode_opaque() actually writes.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89673"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:53Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix XDR padding calculation in ff_encode_getdeviceinfo\n\nnfsd4_ff_encode_getdeviceinfo() computes the da_addr_body reservation\nas 16 + netid_len + addr_len, but the subsequent xdr_encode_opaque()\ncalls emit 8 + round_up(netid_len, 4) + round_up(addr_len, 4) bytes.\nThe mismatch means the declared da_addr_body length exceeds the actual\nencoded data by 2-8 bytes on every flexfile GETDEVICEINFO reply,\nleaking stale reply-page content to the client and mis-aligning the\nsubsequent version list decode.\n\nUse xdr_align_size() for each string length to match what\nxdr_encode_opaque() actually writes.",
  "id": "GHSA-fpgc-gpfg-74f9",
  "modified": "2026-09-14T15:32:33Z",
  "published": "2026-09-11T21:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89673"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41ebca28e17f84293650598f86bd69532ec1a8e0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/62e5949f0dd5ec837af144860ff908369df4c7c9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/74015b7be806ad9e21d46f7bd2831df280c6c783"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88bce7e326c368d7df15126ccac537e54bebd467"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8b989aaec85e1293a871d602590c951fe44b8647"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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