{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e0639dc5805a9d4faaa2c07ad98fa853b9529dd3"
            },
            {
              "fixed": "9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7a"
            },
            {
              "fixed": "14b978e8d05ce018d0afbeb6611833ef91713a02"
            },
            {
              "fixed": "d0beaee498e11880e72826026db0e9c9890fc114"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.20.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89676.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix stale s2s_cp_stateids IDR entry for async COPY\n\nFor an async COPY, nfsd4_copy() called nfs4_init_copy_state() before\ndup_copy_fields(), so the s2s_cp_stateids IDR was pointed at\n\u0026u-\u003ecopy-\u003ecp_stateid -- memory in the per-rqstp COMPOUND buffer that is\nreused by the next request. dup_copy_fields() copies only the value into\nasync_copy, so the IDR slot dangled at the transient buffer for the whole\nbackground copy. Any IDR walker then dereferences reused request memory:\nthe laundromat reads cs_type from it and, if the bytes look like an\nexpired NFS4_COPYNOTIFY_STID, follows into\nrefcount_dec()/idr_remove()/kfree() on garbage; manage_cpntf_state() has\nthe same exposure via idr_find().\n\nDuplicate the fields first, then register the stateid on the stable\nasync_copy. result-\u003ecb_stateid is unchanged.",
  "id": "CVE-2026-89676",
  "modified": "2026-09-15T03:31:01.889635969Z",
  "published": "2026-09-11T19:46:00.382Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/14b978e8d05ce018d0afbeb6611833ef91713a02"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0beaee498e11880e72826026db0e9c9890fc114"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89676.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89676"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "nfsd: fix stale s2s_cp_stateids IDR entry for async COPY"
}