{
  "cveId": "CVE-2026-89708",
  "url": "https://patchblox.com/security/cve/CVE-2026-89708",
  "summary": "CVE-2026-89708 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-89708, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown  After a DESTROY_SESSION the per-session teardown path can free a session while rpciod still holds an inflight callback rpc_task that dereferences clp-\u003Ecl_cb_session.  nfsd4_probe_callback_sync() flushes cl_callback_wq, but once nfsd4_run_cb_work() has called rpc_call_async() the rpc_task lives on rpciod; flushing the workqueue does not wait for it.  rpc_shutdown_client() does drain rpciod tasks, but uses a 1-second wait_event_timeout \u2014 tasks stuck in rpc_delay() (e.g. 2-second NFS4ERR_DELAY retries) can outlive the drain.      destroy path                       rpciod     ------------                       ------     unhash_session(ses)     nfsd4_probe_callback_sync(clp)       flush_workqueue(cl_callback_wq)       /* returns; rpc_task still live */     nfsd4_put_session_locked(ses)     free_session(ses) -\u003E kfree(ses)                                        nfsd4_cb_sequence_done()                                          reads cb_clp-\u003Ecl_cb_session                                          /* freed slab */  A second window exists in nfsd4_process_cb_update().  When __nfsd4_find_backchannel() returns NULL because unhash_session() has already removed the destroyed session from cl_sessions, setup_callback_client() takes the v4.1 early return so clp-\u003Ecl_cb_session = ses never fires and the field retains a pointer to the about-to-be-freed session.  Fix both by converting cl_cb_session to an RCU-protected pointer:    - Move the cl_cb_session = ses assignment in setup_callback_client()     to after rpc_create() succeeds, so it is only published when a     working backchannel exists.  Clear cl_cb_session on the error     return in nfsd4_process_cb_update().  Both stores use     rcu_assign_pointer().    - Annotate cl_cb_session with __rcu.  All rpciod-side readers use     rcu_read_lock()/rcu_dereference() and check for NULL, bailing to     the appropriate error or requeue path:     encode_cb_sequence4args(), decode_cb_sequence4resok(),     nfsd41_cb_get_slot(), nfsd41_cb_release_slot(),     nfsd4_cb_prepare(), and nfsd4_cb_sequence_done().    - Switch __free_session() from kfree() to kfree_rcu() so the     session slab is not reclaimed until after an RCU grace period,     guaranteeing that rpciod readers inside rcu_read_lock() never     dereference freed memory.    - Pass the session pointer to the nfsd_cb_seq_status and     nfsd_cb_free_slot tracepoints instead of having them re-read     cl_cb_session.    - nfsd4_cb_prepare() calls rpc_exit() when the session is NULL,     routing through the done/release path to requeue the callback.",
  "published": "2026-09-11T20:19:58Z",
  "severity": "Important",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00444,
  "epssPercentile": 0.3887,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89708",
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      "fix": "ALAS2023-2026-3187",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.51-120.162.amzn2023",
      "fix": "ALAS2023-2026-3187",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187",
      "released": "2026-11-07T01:06:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}