CVE-2026-90206 (GCVE-0-2026-90206)
Vulnerability from cvelistv5
Published
2026-09-17 16:07
Modified
2026-10-30 12:34
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet: fix max_qid race between configfs and controller allocation The function nvmet_subsys_attr_qid_max_store() can race against nvmet_alloc_ctrl() when a subsystem's max_qid limit is modified. Suppose max_qid is currently 64. If nvmet_alloc_ctrl() executes: ctrl->sqs = kzalloc_objs(struct nvmet_sq *, subsys->max_qid + 1); and at this exact point, a userspace process changes max_qid to 128, nvmet_subsys_attr_qid_max_store() will set the new max_qid value. It attempts to delete active controllers to force a reconnect, but the new controller won't be deleted because it hasn't been added to the subsys->ctrls list yet. nvmet_alloc_ctrl() then proceeds and adds the new controller to the subsys->ctrls list. Later, when nvmet_install_queue() is called, it will see max_qid set to 128, but the memory allocated for sqs is only sized for 64 entries. This results in a KASAN out-of-bounds warning and potential memory corruptions. Fix this by protecting the queue allocations and list insertion in nvmet_alloc_ctrl() with down_read(&nvmet_config_sem). Because nvmet_subsys_attr_qid_max_store() acquires down_write(&nvmet_config_sem) to modify the attribute, this safely prevents the configfs writer from modifying max_qid during controller creation. Copy the max_qid from the subsystem to the controller's structure during the allocation; ctrl->max_qid never changes as long as the controller remains in LIVE state, so this will prevent similar race conditions.
References
Impacted products
Vendor Product Version
Linux Linux Version: 3e980f5995e0bb4d86fef873a9c9ad66721580d0
Version: 3e980f5995e0bb4d86fef873a9c9ad66721580d0
Version: 3e980f5995e0bb4d86fef873a9c9ad66721580d0
Version: 3e980f5995e0bb4d86fef873a9c9ad66721580d0
Version: 3e980f5995e0bb4d86fef873a9c9ad66721580d0
Version: 3e980f5995e0bb4d86fef873a9c9ad66721580d0
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/target/admin-cmd.c",
            "drivers/nvme/target/core.c",
            "drivers/nvme/target/fabrics-cmd.c",
            "drivers/nvme/target/nvmet.h",
            "drivers/nvme/target/pci-epf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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            "drivers/nvme/target/fabrics-cmd.c",
            "drivers/nvme/target/nvmet.h",
            "drivers/nvme/target/pci-epf.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "version": "0",
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              "version": "7.2.6",
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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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\nnvmet: fix max_qid race between configfs and controller allocation\n\nThe function nvmet_subsys_attr_qid_max_store() can race against\nnvmet_alloc_ctrl() when a subsystem\u0027s max_qid limit is modified.\n\nSuppose max_qid is currently 64. If nvmet_alloc_ctrl() executes:\nctrl-\u003esqs = kzalloc_objs(struct nvmet_sq *, subsys-\u003emax_qid + 1);\nand at this exact point, a userspace process changes max_qid to 128,\nnvmet_subsys_attr_qid_max_store() will set the new max_qid value. It\nattempts to delete active controllers to force a reconnect, but the\nnew controller won\u0027t be deleted because it hasn\u0027t been added to the\nsubsys-\u003ectrls list yet.\n\nnvmet_alloc_ctrl() then proceeds and adds the new controller to the\nsubsys-\u003ectrls list. Later, when nvmet_install_queue() is called, it\nwill see max_qid set to 128, but the memory allocated for sqs is only\nsized for 64 entries. This results in a KASAN out-of-bounds warning\nand potential memory corruptions.\n\nFix this by protecting the queue allocations and list insertion in\nnvmet_alloc_ctrl() with down_read(\u0026nvmet_config_sem). Because\nnvmet_subsys_attr_qid_max_store() acquires down_write(\u0026nvmet_config_sem)\nto modify the attribute, this safely prevents the configfs writer from\nmodifying max_qid during controller creation.\n\nCopy the max_qid from the subsystem to the controller\u0027s structure\nduring the allocation; ctrl-\u003emax_qid never changes as long as the\ncontroller remains in LIVE state, so this will prevent similar race\nconditions."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:34:46.536Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cae0f5ed6ce7af3f7e0003c417f1953a350f55bf"
        },
        {
          "url": "https://git.kernel.org/stable/c/af811970da4f0a928f5a1b1a946a04f755ce86f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/a1b88a1782eb6b368071dcda548a41b5c23d8cd2"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e6f8e3bfc66dff1833a48ecfd857268cff3be84"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c23fc91789dfd9db746edb3ae9b90d65fabd410"
        },
        {
          "url": "https://git.kernel.org/stable/c/f1a8846e06388113dfdbb89dee005083fa9afdf9"
        }
      ],
      "title": "nvmet: fix max_qid race between configfs and controller allocation",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90206",
    "datePublished": "2026-09-17T16:07:22.173Z",
    "dateReserved": "2026-09-11T19:38:34.793Z",
    "dateUpdated": "2026-10-30T12:34:46.536Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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