{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup  nfs40_clean_admin_revoked() takes a stateid reference under clp-\u003ecl_lock, drops nn-\u003eclient_lock, and calls nfsd4_drop_revoked_stid(), which dereferences the stateid's client through s-\u003esc_client-\u003ecl_lock.  The stateid reference does not pin the client, so a teardown racing the dropped lock can free the client while nfsd4_drop_revoked_stid() is still using it.  This cleanup runs from the laundromat, so a periodic sweep can race force_expire_client() driven by a write to the clients/\u003cid\u003e/ctl file.  Skip a client that is already expiring and otherwise pin it with cl_rpc_users under client_lock before dropping the lock, matching nfsd4_revoke_states().",
  "id": "DEBIAN-CVE-2026-89658",
  "modified": "2026-09-14T08:47:37.492479178Z",
  "published": "2026-09-11T20:19:52.063Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-89658"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-89658"
  ]
}