CVE-2026-98354 (GCVE-0-2026-98354)
Vulnerability from cvelistv5
Published
2026-10-06 08:46
Modified
2026-10-19 09:18
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/mad: Fix receive buffer leak when PKey enforcement fails ib_mad_complete_recv() initializes mad_recv_wc->rmpp_list and then runs ib_mad_enforce_security() before linking recv_buf onto that list. On failure it calls ib_free_recv_mad(), which only walks rmpp_list and frees the ib_mad_private of every buffer found there. As the list is still empty at that point, nothing is freed at all. The caller cannot clean up either: ib_mad_recv_done() sets recv to NULL right after ib_mad_complete_recv() returns, assuming the MAD layer took ownership of the buffer. Every MAD that fails the PKey check therefore leaks one ib_mad_private (about 300 bytes per IB port MAD, ~2K for OPA), and a remote node can trigger this repeatedly by sending MADs with a wrong PKey. Link recv_buf onto rmpp_list right after the list is initialized, so the error path has something to free.
References
Impacted products
Vendor Product Version
Linux Linux Version: 47a2b338fe63200d716d2e24131cdb49f17c77da
Version: 47a2b338fe63200d716d2e24131cdb49f17c77da
Version: 47a2b338fe63200d716d2e24131cdb49f17c77da
Version: 47a2b338fe63200d716d2e24131cdb49f17c77da
Version: 47a2b338fe63200d716d2e24131cdb49f17c77da
Version: 47a2b338fe63200d716d2e24131cdb49f17c77da
Version: 47a2b338fe63200d716d2e24131cdb49f17c77da
Version: 47a2b338fe63200d716d2e24131cdb49f17c77da
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{
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          "programFiles": [
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      "cpeApplicability": [
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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\nRDMA/mad: Fix receive buffer leak when PKey enforcement fails\n\nib_mad_complete_recv() initializes mad_recv_wc-\u003ermpp_list and then runs\nib_mad_enforce_security() before linking recv_buf onto that list.  On\nfailure it calls ib_free_recv_mad(), which only walks rmpp_list and frees\nthe ib_mad_private of every buffer found there.  As the list is still\nempty at that point, nothing is freed at all.\n\nThe caller cannot clean up either: ib_mad_recv_done() sets recv to NULL\nright after ib_mad_complete_recv() returns, assuming the MAD layer took\nownership of the buffer.  Every MAD that fails the PKey check therefore\nleaks one ib_mad_private (about 300 bytes per IB port MAD, ~2K for OPA),\nand a remote node can trigger this repeatedly by sending MADs with a\nwrong PKey.\n\nLink recv_buf onto rmpp_list right after the list is initialized, so the\nerror path has something to free."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:18:04.973Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4617c9a856188674dddb0ca66979746d07688579"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e2036fb47a5b152d53eadbd35abf311bd34cc7f"
        },
        {
          "url": "https://git.kernel.org/stable/c/bad289e42f512646a988f278f536d21547df73f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/752b30e9d339008e5ce7eed412e9446078916129"
        },
        {
          "url": "https://git.kernel.org/stable/c/39c4ea72a40503e102ae07e6776005f96ca078a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/5091e25ec503f7fc02723ca435226467b68caac7"
        },
        {
          "url": "https://git.kernel.org/stable/c/c0d8df85db146d6275e226cb950023be69dd6c77"
        },
        {
          "url": "https://git.kernel.org/stable/c/3476c28c9addfa253f505e6bd87f1f5598b961d0"
        }
      ],
      "title": "RDMA/mad: Fix receive buffer leak when PKey enforcement fails",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98354",
    "datePublished": "2026-10-06T08:46:41.768Z",
    "dateReserved": "2026-09-25T10:25:14.343Z",
    "dateUpdated": "2026-10-19T09:18:04.973Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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