GHSA-WHP9-3996-XQG3

Vulnerability from github – Published: 2026-10-06 09:31 – Updated: 2026-10-06 09:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

RDMA/siw: Clear association under lock if siw_qp_modify fails in siw_accept

We need to clear cep before release state_lock as siw_qp_llp_close and siw_qp_modify->siw_qp_llp_close did.

Otherwise if siw_qp_modify() fails in siw_accept(), the QP's state_lock is released before the error path cleanup. A concurrent ibv_modify_qp() transitioning the QP to ERROR can race in this window:

siw_accept() ibv_modify_qp(ERROR) ---------------------- ---------------------- siw_qp_modify() fails up_write(&qp->state_lock) down_write(&qp->state_lock) nextstate_from_idle(): if (qp->cep) siw_cep_put(qp->cep) <- frees cep qp->cep = NULL goto error cep->qp = NULL <- UAF

Clear qp->cep and drop the association reference taken by siw_cep_get(), all under the write lock held from the initial down_write(&qp->state_lock). Thread B therefore sees qp->cep == NULL, skips its own put, and cannot free the cep before siw_accept() is done with it.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98367"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-06T09:18:30Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: Clear association under lock if siw_qp_modify fails in siw_accept\n\nWe need to clear cep before release state_lock as siw_qp_llp_close and\nsiw_qp_modify-\u003esiw_qp_llp_close did.\n\nOtherwise if siw_qp_modify() fails in siw_accept(), the QP\u0027s state_lock\nis released before the error path cleanup. A concurrent ibv_modify_qp()\ntransitioning the QP to ERROR can race in this window:\n\n  siw_accept()                       ibv_modify_qp(ERROR)\n  ----------------------             ----------------------\n  siw_qp_modify() fails\n  up_write(\u0026qp-\u003estate_lock)\n                                     down_write(\u0026qp-\u003estate_lock)\n                                     nextstate_from_idle():\n\t\t\t\t     if (qp-\u003ecep)\n                                       siw_cep_put(qp-\u003ecep) \u003c- frees cep\n                                       qp-\u003ecep = NULL\n  goto error\n    cep-\u003eqp = NULL                   \u003c- UAF\n\nClear qp-\u003ecep and drop the association reference taken by siw_cep_get(),\nall under the write lock held from the initial down_write(\u0026qp-\u003estate_lock).\nThread B therefore sees qp-\u003ecep == NULL, skips its own put, and cannot free\nthe cep before siw_accept() is done with it.",
  "id": "GHSA-whp9-3996-xqg3",
  "modified": "2026-10-06T09:31:36Z",
  "published": "2026-10-06T09:31:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98367"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/030306bbb9273af80f14d7af20129661964cd9a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/32cd87f54dd1070020e664ccb0312a9f0fea79b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9dcc0f4e488b70cff81e0e5717a498c929cf5de3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad50d19f3d1ce052b3a146143581e930a1efb33e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bfdc744bf20ae4c3ef2e470298de5237c5c9a13c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df2584750314336edcbcc21fb388e04b260f35b7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3f039082856adab7e195dea1af45d93dd6a3f1c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f11e09fe2fc3a11ccdf8f932b68181b0bb1d2078"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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