RDMA/rxe: Avoid reprocessing the current packet after the QP enters the error state

{
  "id": "ab3959dcd9ad5e8142ed0c217e57312be711cfed1889628155b5d87256d86aa5",
  "url": "https://osv.dev/vulnerability/CVE-2026-93107",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RDMA/rxe: Avoid reprocessing the current packet after the QP enters the error state",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Avoid reprocessing the current packet after the QP enters the error state When do_complete() finds the QP in the error state it returns RESPST_CHK_RESOURCE. Before commit 49dc9c1f0c7e (\"RDMA/rxe: Cleanup reset state handling in rxe_resp.c\") this was the flush loop: check_resource() had an error-state branch that fetched each remaining recv WQE and completed it with IB_WC_WR_FLUSH_ERR, without touching the current packet. That commit removed the error-state branch from check_resource() (draining is now done at rxe_receiver() entry) but kept the do_complete() error-state return. As a result, when a QP moves to the error state while a packet is being completed - e.g. an rdma_cm disconnect racing with receive processing - the responder state machine loops back into the request processing chain with the already-completed packet still in hand: check_resource() fetches a fresh recv WQE, execute()/send_data_in() copies the same packet payload again, do_complete() posts another IB_WC_SUCCESS CQE (qp->resp.status is still 0), and control returns to the error-state check. The loop re-executes the same packet once per posted recv WQE (observed: ~1000 duplicate IB_WC_SUCCESS completions of one SEND, one per ~8us, matching the RQ occupancy) until the RQ is exhausted, after which qp->resp.wqe is NULL and send_data_in() dereferences it: BUG: kernel NULL pointer dereference, address: 0000000000000014 Workqueue: rxe_",
    "evidence": "osv:CVE-2026-93107",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-93107",
      "aliases": [
        "CVE-2026-93107"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "49dc9c1f0c7e396654a31a480328fffd902fa494"
                },
                {
                  "fixed": "c319b986a88cedf600c4497cd7814a891b2f9e7c"
                },
                {
                  "fixed": "62a4b48767e06fdd64548450fae2b1ffc6ff5d69"
                },
                {
                  "fixed": "399713f1f0eac641351c8ceaec0ab8244ddcf78c"
                },
                {
                  "fixed": "0d37e2503efd1069a74be740eadf63ea17c96810"
                },
                {
                  "fixed": "15ae32c4a3551c4c9da457370bdfdd65d171e512"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93107.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.4.0"
                },
                {
                  "fixed": "6.6.157"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.110"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.52"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93107.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.900742813Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0d37e2503efd1069a74be740eadf63ea17c96810",
        "https://git.kernel.org/stable/c/15ae32c4a3551c4c9da457370bdfdd65d171e512",
        "https://git.kernel.org/stable/c/399713f1f0eac641351c8ceaec0ab8244ddcf78c",
        "https://git.kernel.org/stable/c/62a4b48767e06fdd64548450fae2b1ffc6ff5d69",
        "https://git.kernel.org/stable/c/c319b986a88cedf600c4497cd7814a891b2f9e7c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93107.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93107",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93107.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-93107",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492599,
  "published_at": "2026-09-17T16:11:17.791+00:00"
}