{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-93221",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-93221"
  ],
  "published": "2026-09-24T15:10:53Z",
  "summary": "nfsd: convert nfsd_net boolean flags to unsigned long flags word",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: convert nfsd_net boolean flags to unsigned long flags word\n\nnfsd_net contains several boolean fields that are accessed from\nconcurrent contexts without serialization.  In particular,\nnfsd4_end_grace() guards its drain path with a plain bool:\n\n    if (nn->grace_ended)\n            return;\n    nn->grace_ended = true;\n\nThe read and the write are independent, and nothing in struct\nnfsd_net serializes them.  At least two contexts can reach this\ncode with no lock held:\n\n    laundromat path\n      laundry_wq kworker\n        nfs4_laundromat()\n          nfsd4_end_grace()\n\n    RECLAIM_COMPLETE path\n      nfsd compound kthread\n        nfsd4_reclaim_complete()\n          inc_reclaim_complete()\n            nfsd4_end_grace()\n\nBoth callers can observe grace_ended == false on different CPUs,\nboth store true, and both proceed into nfsd4_record_grace_done(),\nwhich invokes the active client_tracking_ops->grace_done callback.\nFor tracking ops that drain reclaim_str_hashtbl (legacy_tracking_ops\nvia nfsd4_recdir_purge_old, and the cld v1+ ops via\nnfsd4_cld_grace_done), grace_done calls nfs4_release_reclaim(),\nwhich walks every bucket of reclaim_str_hashtbl with no lock and\ncalls nfs4_remove_reclaim_record() (list_del + kfree) on each\nentry.  Two concurrent walkers corrupt the list and double-free\nevery nfs4_client_reclaim.  A concurrent nfsd4_find_reclaim_client()\niterating the same bucket reads through freed memory.\n\nA third call site exists in nfs4_state_start_net() on the\nskip_grace startup path, but it runs under nfsd_mutex before any\nclient has connected and before the laundromat's first delayed\nwork fires, so it cannot race with the two callers above.\n\nReplace the scattered boolean fields in nfsd_net with a single\nunsigned long flags word and an enum nfsd_net_flag for the bit\npositions.  The grace_ended race is fixed by using\ntest_and_set_bit(), which is atomic on all architectures.  The\nremaining flags (grace_end_forced, in_grace, somebody_reclaimed,\ntrack_reclaim_completes, nfsd_net_up, lockd_up) are converted to\nuse test_bit/set_bit/clear_bit for consistency.  This avoids\nsub-word cmpxchg issues on architectures like Hexagon that only\nsupport word-sized atomic operations.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-93221"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/df5922fe09a8131c793ffa86adf204999b0470f8"
    },
    {
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      "url": "https://git.kernel.org/stable/c/11a5fe42e1811f793e04ef885b639ea7668f439d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-25T05:22:58Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - nfsd4_end_grace() is reached from a remote NFSv4.1 RECLAIM_COMPLETE: svc_recv to nfsd_dispatch to nfsd4_proc_compound to nfsd4_sequence (sets cstate->clp) to nfsd4_reclaim_complete to inc_reclaim_complete to nfsd4_end_grace on TCP/2049. That RECLAIM_COMPLETE compound is the attacker-supplied protocol message.\nAC:H - The other nfsd4_end_grace() caller is nfs4_laundromat() on laundry_wq, queued in nfs4_state_start_net() for nn->nfsd4_grace seconds. A peer cannot start that work (nfsd4_force_end_grace is only write_v4_end_grace). Both must see grace_ended==false, which needs an already-running grace with a non-empty reclaim_str_hashtbl the attacker cannot create on demand.\nPR:N - Typical nfsd exports accept AUTH_SYS, so the client only asserts a uid. nfsd4_exchange_id() with SP4_NONE and nfsd4_create_session() are ALLOWED_AS_FIRST_OP without a filehandle, and OP_RECLAIM_COMPLETE is ALLOWED_WITHOUT_FH, so no fh_verify, share access, or Kerberos is required.\nUI:N - The attacker sends EXCHANGE_ID, CREATE_SESSION, SEQUENCE, and RECLAIM_COMPLETE on their own session. No write to v4_end_grace, mount, or other victim action is required.\nS:U - Concurrent nfs4_release_reclaim() list_del/kfree of nfs4_client_reclaim entries corrupts heap inside the host nfsd kernel. That stays in the same kernel security authority and is not a VM, IOMMU, or sandbox escape.\nC:H - When two nfsd4_end_grace() callers both run nfsd4_record_grace_done() (nfsd4_cld_grace_done or nfsd4_recdir_purge_old), nfs4_release_reclaim() double-frees every nfs4_client_reclaim while nfsd4_find_reclaim_client() walks the same unlocked cr_strhash bucket through freed objects, a UAF read primitive.\nI:H - nfs4_remove_reclaim_record() does unlocked list_del(&crp->cr_strhash) then kfree on each nfs4_client_reclaim. Two concurrent walkers corrupt adjacent list pointers (unlink write) and double-free the slab objects, which is an arbitrary kernel write.\nA:H - The same unlocked list_del/kfree in nfs4_release_reclaim(), or nfsd4_find_reclaim_client() following a freed cr_strhash, oopses the host kernel (poisoned list pointers or double-free of nfs4_client_reclaim), a full availability loss."
    }
  }
}