CVE-2026-89673 affecting package kernel 6.6.157.1-1

{
  "id": "d7469636a113998028fc0b6a7b63e197b5026fb1153bb508a8acacdf9e9e2b75",
  "url": "https://osv.dev/vulnerability/AZL-100091",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-89673 affecting package kernel 6.6.157.1-1",
    "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.",
    "evidence": "osv:AZL-100091",
    "products": [
      {
        "name": {
          "value": "kernel",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "AZL-100091",
      "aliases": [
        "AZL-100091"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "6.6.157.1-1"
                }
              ]
            }
          ],
          "package": {
            "name": "kernel",
            "purl": "pkg:rpm/azure-linux/kernel",
            "ecosystem": "Azure Linux:3"
          },
          "database_specific": {
            "source": "https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-100091.json"
          }
        }
      ],
      "modified": "2026-10-24T05:31:56Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-89673"
      ],
      "references": [
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89673"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-89673",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 428211,
  "published_at": "2026-09-11T20:19:53+00:00"
}