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CVE-2026-74383 (GCVE-0-2026-74383)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:46
VLAI
Title
nvme-pci: fix out-of-bounds access in nvme_setup_descriptor_pools
Summary
In the Linux kernel, the following vulnerability has been resolved: nvme-pci: fix out-of-bounds access in nvme_setup_descriptor_pools nvme_setup_descriptor_pools() indexes dev->descriptor_pools[] using the numa_node forwarded from hctx->numa_node by its single caller, nvme_init_hctx_common(). On a non-NUMA kernel hctx->numa_node is NUMA_NO_NODE (-1). Because the parameter was declared 'unsigned', the value becomes UINT_MAX and the index walks off the array (sized to nr_node_ids), faulting during nvme_alloc_ns() and leaving the namespace without a /dev node. Reproduces on any NVMe controller probed by a CONFIG_NUMA=n kernel: BUG: unable to handle page fault for address: ffff889101603d38 RIP: 0010:nvme_init_hctx_common+0x5a/0x190 [nvme] Call Trace: nvme_init_hctx+0x10/0x20 [nvme] nvme_alloc_ns+0x9e/0xa10 [nvme_core] nvme_scan_ns+0x301/0x3b0 [nvme_core] nvme_scan_ns_async+0x23/0x30 [nvme_core] Switch the parameter to int and fall back to node 0 when it is NUMA_NO_NODE; node 0 is always present.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d977506f8863807129d7a11f4057dfb1b38085ea , < 3e8aed5edaeeb237f97255d711aac6b5843fc059 (git)
Affected: d977506f8863807129d7a11f4057dfb1b38085ea , < fa9b6accd1ad7af6914b409c6b003c417724c299 (git)
Affected: d977506f8863807129d7a11f4057dfb1b38085ea , < a192b8cfa447e1b3701a13434a31c392b2e7ed29 (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/pci.c"
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          "versions": [
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                }
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              "negate": false,
              "operator": "OR"
            }
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        }
      ],
      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-pci: fix out-of-bounds access in nvme_setup_descriptor_pools\n\nnvme_setup_descriptor_pools() indexes dev-\u003edescriptor_pools[] using the\nnuma_node forwarded from hctx-\u003enuma_node by its single caller,\nnvme_init_hctx_common().  On a non-NUMA kernel hctx-\u003enuma_node is\nNUMA_NO_NODE (-1).  Because the parameter was declared \u0027unsigned\u0027, the\nvalue becomes UINT_MAX and the index walks off the array (sized to\nnr_node_ids), faulting during nvme_alloc_ns() and leaving the namespace\nwithout a /dev node.\n\nReproduces on any NVMe controller probed by a CONFIG_NUMA=n kernel:\n\n  BUG: unable to handle page fault for address: ffff889101603d38\n  RIP: 0010:nvme_init_hctx_common+0x5a/0x190 [nvme]\n  Call Trace:\n   nvme_init_hctx+0x10/0x20 [nvme]\n   nvme_alloc_ns+0x9e/0xa10 [nvme_core]\n   nvme_scan_ns+0x301/0x3b0 [nvme_core]\n   nvme_scan_ns_async+0x23/0x30 [nvme_core]\n\nSwitch the parameter to int and fall back to node 0 when it is\nNUMA_NO_NODE; node 0 is always present."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is in the nvme-pci host driver and is reached during local PCIe NVMe controller probe and namespace scan (nvme_probe/nvme_scan_work\u2192nvme_alloc_ns\u2192blk_mq_alloc_disk\u2192nvme_init_hctx_common), including rescan via NVME_IOCTL_RESCAN/sysfs and AER NS_CHANGED events from a locally attached device; there is no network-facing entry point.\nAC:L - On CONFIG_NUMA=n kernels, hctx-\u003enuma_node is always NUMA_NO_NODE, so the unsigned wrap to UINT_MAX and subsequent out-of-bounds access occur deterministically the first time any namespace hardware context is initialized for a probed NVMe controller, without races or attacker-influenced memory layout.\nPR:N - Exploitation requires no host OS credentials: any locally attached PCIe NVMe controller (boot-present, hot-plugged, supply-chain, or kiosk/shared-workstation storage) triggers the vulnerable scan during probe or when device firmware delivers a namespace-changed async event, without CAP_SYS_ADMIN or other privileges.\nUI:N - Triggering the bug does not require any victim user action such as mounting a filesystem or opening a device node; namespace scanning runs automatically from driver probe, controller rescan, or device-generated AER notifications handled entirely in kernel workqueues.\nS:U - Impact is confined to kernel memory corruption and crash within the host kernel NVMe/PCI driver security domain; it does not cross a VM, container, or IOMMU boundary to compromise a separate security authority.\nC:H - The vulnerable code performs an out-of-bounds read of descriptor_pools[UINT_MAX] (checking pools-\u003esmall) far beyond the nr_node_ids-sized allocation, constituting an unbounded kernel memory read that can disclose adjacent kernel data if the access does not immediately fault.\nI:H - The same out-of-bounds index would be used for dma_pool_create_node writes to pools-\u003elarge and pools-\u003esmall, giving an out-of-bounds kernel write primitive; even when the fault occurs on the initial read, this is exploitable-class memory corruption rather than a benign NULL dereference.\nA:H - The reported reproducer causes a kernel page fault in nvme_init_hctx_common during nvme_alloc_ns, producing an oops that aborts namespace creation and can panic the system, denying storage availability on CONFIG_NUMA=n hosts with NVMe controllers."
            }
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        "dateUpdated": "2026-08-17T05:46:33.114Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3e8aed5edaeeb237f97255d711aac6b5843fc059"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa9b6accd1ad7af6914b409c6b003c417724c299"
        },
        {
          "url": "https://git.kernel.org/stable/c/a192b8cfa447e1b3701a13434a31c392b2e7ed29"
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      "title": "nvme-pci: fix out-of-bounds access in nvme_setup_descriptor_pools",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74383",
    "datePublished": "2026-08-15T05:58:59.767Z",
    "dateReserved": "2026-08-15T05:44:03.890Z",
    "dateUpdated": "2026-08-17T05:46:33.114Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "percentile": "0.03849"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T20:53:38+00:00",
      "cve": "CVE-2026-74383",
      "id": "CVE-2026-74383",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nvme-pci: fix out-of-bounds access in nvme_setup_descriptor_pools",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74383.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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