CVE-2026-89798 (GCVE-0-2026-89798)
Vulnerability from cvelistv5
Published
2026-09-16 10:30
Modified
2026-10-19 08:52
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: rpcrdma: arm rn_done before publishing the notification rpcrdma_rn_register() inserts @rn into rd_xa with xa_alloc() before storing the caller's callback in rn->rn_done. The xarray makes @rn reachable to rpcrdma_remove_one(), which walks rd_xa and invokes rn->rn_done(rn) for every registered notification. A device removal that races a fresh registration can therefore observe @rn with rn_done still NULL, because the notification objects are zero allocated by their owners, and call through a NULL function pointer. Store rn->rn_done before xa_alloc() publishes @rn. The xarray's store-side and load-side ordering then guarantees that any CPU which finds @rn in rd_xa also observes the armed callback. rpcrdma_rn_unregister() treats a non-NULL rn_done as the sentinel for a completed registration, so the early store must not survive a failed registration. Clear rn_done again when xa_alloc() fails. Were it left set, the failed-accept cleanup path would call rpcrdma_rn_unregister() on an @rn that was never inserted, erasing an unrelated rd_xa slot and underflowing rd_kref.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7e86845a0346efc95fddaa97ce5cd6a8bda8c71c
Version: 7e86845a0346efc95fddaa97ce5cd6a8bda8c71c
Version: 7e86845a0346efc95fddaa97ce5cd6a8bda8c71c
Version: 7e86845a0346efc95fddaa97ce5cd6a8bda8c71c
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          "programFiles": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrpcrdma: arm rn_done before publishing the notification\n\nrpcrdma_rn_register() inserts @rn into rd_xa with xa_alloc() before\nstoring the caller\u0027s callback in rn-\u003ern_done. The xarray makes @rn\nreachable to rpcrdma_remove_one(), which walks rd_xa and invokes\nrn-\u003ern_done(rn) for every registered notification. A device removal\nthat races a fresh registration can therefore observe @rn with\nrn_done still NULL, because the notification objects are zero\nallocated by their owners, and call through a NULL function pointer.\n\nStore rn-\u003ern_done before xa_alloc() publishes @rn. The xarray\u0027s\nstore-side and load-side ordering then guarantees that any CPU which\nfinds @rn in rd_xa also observes the armed callback.\n\nrpcrdma_rn_unregister() treats a non-NULL rn_done as the sentinel\nfor a completed registration, so the early store must not survive a\nfailed registration. Clear rn_done again when xa_alloc() fails.\nWere it left set, the failed-accept cleanup path would call\nrpcrdma_rn_unregister() on an @rn that was never inserted, erasing\nan unrelated rd_xa slot and underflowing rd_kref."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:52:52.994Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/f9fe3cad43c42d874a388583552b39b411d886eb"
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        {
          "url": "https://git.kernel.org/stable/c/3c97b8e76ca2bba9e8770571413aed694068e78e"
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        },
        {
          "url": "https://git.kernel.org/stable/c/5b06f706374c37375bdff9d21cc10e61df925a92"
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      ],
      "title": "rpcrdma: arm rn_done before publishing the notification",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89798",
    "datePublished": "2026-09-16T10:30:29.930Z",
    "dateReserved": "2026-09-11T19:38:34.767Z",
    "dateUpdated": "2026-10-19T08:52:52.994Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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