CVE-2026-98367 (GCVE-0-2026-98367)
Vulnerability from cvelistv5
Published
2026-10-06 08:46
Modified
2026-10-19 09:18
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6c52fdc244b5ccc468006fd65a504d4ee33743c7
Version: 6c52fdc244b5ccc468006fd65a504d4ee33743c7
Version: 6c52fdc244b5ccc468006fd65a504d4ee33743c7
Version: 6c52fdc244b5ccc468006fd65a504d4ee33743c7
Version: 6c52fdc244b5ccc468006fd65a504d4ee33743c7
Version: 6c52fdc244b5ccc468006fd65a504d4ee33743c7
Version: 6c52fdc244b5ccc468006fd65a504d4ee33743c7
Version: 6c52fdc244b5ccc468006fd65a504d4ee33743c7
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/siw/siw_cm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f11e09fe2fc3a11ccdf8f932b68181b0bb1d2078",
              "status": "affected",
              "version": "6c52fdc244b5ccc468006fd65a504d4ee33743c7",
              "versionType": "git"
            },
            {
              "lessThan": "e3f039082856adab7e195dea1af45d93dd6a3f1c",
              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "6c52fdc244b5ccc468006fd65a504d4ee33743c7",
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            },
            {
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            },
            {
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              "versionType": "git"
            },
            {
              "lessThan": "32cd87f54dd1070020e664ccb0312a9f0fea79b4",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/sw/siw/siw_cm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.271",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.222",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.54",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.8",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - siw_accept() is called through the ops.iw_accept hook from iw_cm_accept(), which a local process reaches with the RDMA_USER_CM_CMD_ACCEPT command on /dev/infiniband/rdma_cm. The racing side is the uverbs MODIFY_QP command (ibv_modify_qp to ERROR), also local. No wire message carries data that causes the siw_qp_modify() failure, so the attack is local.\nAC:L - The attacker does control both racing threads, since it owns the QP and issues the accept and modify_qp calls itself. Even so, AC is High: in siw_accept the only way siw_qp_modify() can fail is siw_qp_readq_init() hitting a vcalloc() ENOMEM, and IRD/ORD are capped at 128, so the allocations are small. That failure depends on system-wide memory exhaustion, which the attacker cannot produce on demand.\nPR:L - Running rdma_accept and ibv_modify_qp on a QP the user created on an existing siw device needs only ordinary access to the rdma_cm and uverbs device nodes. Creating the siw link through RDMA_NLDEV_CMD_NEWLINK is admin-only, but no privilege is needed to use a device that already exists.\nUI:N - The attacker drives both siw_accept() and the concurrent ibv_modify_qp(ERROR) through their own rdma_cm and verbs calls, and the connecting peer can be the attacker over loopback. No other user has to do anything.\nS:U - The freed siw_cep and the writes into it both stay inside the kernel\u0027s own security authority. No VM, IOMMU or sandbox boundary is crossed.\nC:H - siw_qp_nextstate_from_idle() frees the siw_cep by calling siw_cep_put(qp-\u003ecep). The error path in siw_accept() then keeps using that freed object: it writes cep-\u003eqp = NULL, runs siw_free_cm_id, and calls siw_cep_set_free_and_put. A reclaimed object in that slot gives the attacker a use-after-free primitive that can be built into a kernel memory leak.\nI:H - After the free, the error path writes cep-\u003eqp = NULL and does kref and lock operations on the dead siw_cep. That corrupts whatever object has taken over the slot, and this kind of UAF write can be used to corrupt kernel data or hijack control flow.\nA:H - A kref_put or lock operation on the freed siw_cep in siw_cep_set_free_and_put can corrupt the slab or oops the kernel, and that crashes the host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:18:19.262Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f11e09fe2fc3a11ccdf8f932b68181b0bb1d2078"
        },
        {
          "url": "https://git.kernel.org/stable/c/e3f039082856adab7e195dea1af45d93dd6a3f1c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ad50d19f3d1ce052b3a146143581e930a1efb33e"
        },
        {
          "url": "https://git.kernel.org/stable/c/030306bbb9273af80f14d7af20129661964cd9a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/df2584750314336edcbcc21fb388e04b260f35b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/9dcc0f4e488b70cff81e0e5717a498c929cf5de3"
        },
        {
          "url": "https://git.kernel.org/stable/c/bfdc744bf20ae4c3ef2e470298de5237c5c9a13c"
        },
        {
          "url": "https://git.kernel.org/stable/c/32cd87f54dd1070020e664ccb0312a9f0fea79b4"
        }
      ],
      "title": "RDMA/siw: Clear association under lock if siw_qp_modify fails in siw_accept",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98367",
    "datePublished": "2026-10-06T08:46:52.452Z",
    "dateReserved": "2026-09-25T10:25:14.344Z",
    "dateUpdated": "2026-10-19T09:18:19.262Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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