{
  "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 admin state revocation  A stateid holds only a bare pointer to its nfs4_client; a stateid reference does not pin it.  The client survives only because __destroy_client() drains its stateids before free_client() runs.  nfsd4_revoke_states() drops nn-\u003eclient_lock across revoke_one_stid(), which dereferences the client to revoke a stateid and read clp-\u003ecl_minorversion.  A teardown racing the dropped lock can free the client first.  Pinning cl_rpc_users under client_lock blocks the DESTROY_CLIENTID and EXCHANGE_ID teardown, which refuses while cl_rpc_users is non-zero. force_expire_client() ignores it: once its wait for cl_rpc_users to reach zero has passed, a later pin goes unnoticed.  Under client_lock, skip a client whose cl_time is already zero -- force_expire_client() clears it there before waiting -- otherwise pin cl_rpc_users before dropping the lock.  The walk then either sees the expiry and skips, or pins in time for that wait to cover the revoke.",
  "id": "DEBIAN-CVE-2026-89660",
  "modified": "2026-09-14T08:47:32.163377263Z",
  "published": "2026-09-11T20:19:52.300Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-89660"
    }
  ],
  "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-2026-89660"
  ]
}