CVE-2026-89673 (GCVE-0-2026-89673)
Vulnerability from cvelistv5
Published
2026-09-11 19:45
Modified
2026-10-24 14:15
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 3f1a2b0b2d575f39ff0bedb5411822fe7446a805
Version: 19a648a07572c70fbe16faf0fafaf3dce9fd998a
Version: 6d08bd22fa2941a4d5ef45ed115dd00e484a93d7
Version: 6372e2ee629894433fe6107d7048536a3280a284
Version: 6372e2ee629894433fe6107d7048536a3280a284
Version: 6372e2ee629894433fe6107d7048536a3280a284
Version: 6372e2ee629894433fe6107d7048536a3280a284
Version: 6372e2ee629894433fe6107d7048536a3280a284
Version: 82e36f0c287769a0430268739a71dbd56df0e679
Version: 6370e66a71c4869247f8f406c2a8b2c43df8998f
Version: 16282aeca44bfac0d1ac3be6cd1a719d6ff3d749
Version: efcae97fa425ca6db9d126e37daccf2d7225cb09
Version: 64c959d59c24c661bd5338e4e6f1f703d7c309a1
Version: 5.10.195   ≤
Version: 5.15.132   ≤
Version: 6.1.53   ≤
Version: 4.14.326   ≤
Version: 4.19.295   ≤
Version: 5.4.257   ≤
Version: 6.4.16   ≤
Version: 6.5.3   ≤
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{
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              "versionType": "original_commit_for_fix"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-24T14:15:11.211Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/356decf074b82bac5564568203c12426dcea3470"
        },
        {
          "url": "https://git.kernel.org/stable/c/15460c8e6c9bc92cda8f68bc419ac082300ab3d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/9be67a6be48ddf2ebaa98c0df671690b8f9666e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/88bce7e326c368d7df15126ccac537e54bebd467"
        },
        {
          "url": "https://git.kernel.org/stable/c/74015b7be806ad9e21d46f7bd2831df280c6c783"
        },
        {
          "url": "https://git.kernel.org/stable/c/41ebca28e17f84293650598f86bd69532ec1a8e0"
        },
        {
          "url": "https://git.kernel.org/stable/c/62e5949f0dd5ec837af144860ff908369df4c7c9"
        },
        {
          "url": "https://git.kernel.org/stable/c/8b989aaec85e1293a871d602590c951fe44b8647"
        }
      ],
      "title": "nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89673",
    "datePublished": "2026-09-11T19:45:58.149Z",
    "dateReserved": "2026-09-11T19:38:34.746Z",
    "dateUpdated": "2026-10-24T14:15:11.211Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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