{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90151",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-90151"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "NFSv4: remove callback IDR entry on client allocation failure",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4: remove callback IDR entry on client allocation failure\n\nnfs4_alloc_client() allocates an NFSv4.0 callback identifier before it\nfinishes setting up the client. If any later initialization step fails,\nthe error path frees the nfs_client directly with nfs_free_client(). That\nbypasses nfs_put_client(), which is where the callback IDR entry is\nremoved during normal teardown.\n\nA failed allocation can therefore leave cb_ident_idr pointing at a freed\nnfs_client. A later NFSv4.0 callback lookup by cb_ident would find the\nstale pointer and take a reference to it.\n\nMake the callback IDR removal helper callable by the allocation failure\npath, and remove the callback identifier before freeing the client.\n\nThis was found by a local static-analysis checker for publish-before-free\nlifetime bugs and confirmed by manual inspection.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/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-2026-90151"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/68c721391b761dbe38d5b0094d2bb6e8489ad92b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9bfdd0f591307b5198826a0e7a5b2f35f87acd2d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7c4812eb96bdcafb31a65b12f2aa96659429d1d4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fc95ca82d5ae598c428ab5a00ae69f8526d59371"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/80b1c3d5a881f7d9081aa9f46da9742878a0f893"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3f2387e8bfbc4efda5d77c3a11a028d0a119c48f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5891c03e150920618db0e9c4ea2d772abacdcfd1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d05c2007b3d84ccba11dc6e9cb3202768cc72f14"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-18T17:55:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - nfs4_find_client_ident() is called from nfs4_callback_compound() with hdr_arg.cb_ident taken by decode_compound_hdr_arg() from an NFSv4.0 CB_COMPOUND on the TCP callback listener that nfs4_callback_up_net() binds to INADDR_ANY via svc_xprt_create(); the remote peer supplies that identifier over routable TCP.\nAC:L - A malicious NFSv4.0 server keeps the callback service up, then forces a later nfs4_alloc_client() to fail after nfs_get_cb_ident_idr() by making rpc_create()/rpc_ping() fail in nfs_create_rpc_client() (nfs4_create_referral_server or nfs4_update_server to an RST-ing address), then sends CB_COMPOUND with the next sequential idr id; no uncontrolled race is required.\nPR:N - nfs4_find_client_ident() runs in nfs4_callback_compound() before check_gss_callback_principal(), and nfs_callback_authenticate() accepts RPC_AUTH_UNIX for CB_COMPOUND, so the peer needs no account or capability on the victim client.\nUI:N - The same peer returns NFS4ERR_MOVED so nfs4_schedule_migration_recovery() or a LOOKUP referral (nfs4_create_referral_server) runs nfs4_alloc_client() from the state manager or automount, then sends the CB_COMPOUND itself; no extra victim mount dialog or file-open is required.\nS:U - The UAF is of an nfs_client published in cb_ident_idr and freed by nfs_free_client(); impact stays in the host kernel and does not cross a VM, IOMMU, or guest/host boundary.\nC:H - nfs4_find_client_ident() does refcount_inc(&clp->cl_count) on the nfs_client that nfs_free_client() already kfree_rcu'd, so a stale cb_ident_idr pointer remains; reclaim of that heap object yields an arbitrary kernel read, as with other kernel UAFs.\nI:H - The same stale-IDR lookup is a use-after-free write (refcount_inc, then nfs_put_client list_del and field access in check_gss_callback_principal/process_op); spraying the freed nfs_client enables arbitrary write and control-flow hijack.\nA:H - refcount_inc on the kfree_rcu'd nfs_client, or later dereference of cl_rpcclient left as ERR_PTR(-EINVAL) when nfs_create_rpc_client() failed, causes a kernel oops/panic even without a full exploit."
    }
  }
}