{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90227",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-90227"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "nvme/ioctl: check SUBMIT_IO with nvme_cmd_allowed()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme/ioctl: check SUBMIT_IO with nvme_cmd_allowed()\n\nUnlike IO_CMD / IO64_CMD, NVME_IOCTL_SUBMIT_IO never calls\nnvme_cmd_allowed(). Unprivileged callers can thus issue I/O on a\npartition device or write through a read-only file descriptor.\n\nPass flags and open_for_write through and reject disallowed commands\nwith -EACCES.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-90227"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c35cd98eed1a863e8dd51073953563cd8c907f68"
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      "url": "https://git.kernel.org/stable/c/95b0591d51dbf9e618d7845883d535e88ad7c8af"
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      "url": "https://git.kernel.org/stable/c/736b7c6adc7a65c4411beff197b6a634f7a6ca27"
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      "url": "https://git.kernel.org/stable/c/b116e9dae433ff631f94c36c61a7a78fe400ed1e"
    },
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-18T17:55:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Attacker-controlled opcode/slba/nblocks enter via copy_from_user of struct nvme_user_io in nvme_submit_io(), reached only through ioctl(NVME_IOCTL_SUBMIT_IO) on an NVMe block or ng* char node (blkdev_ioctl \u2192 nvme_ioctl / nvme_ns_chr_ioctl \u2192 nvme_ns_ioctl). No remote protocol carries that payload.\nAC:L - nvme_submit_io() copies the user nvme_user_io, accepts nvme_cmd_read/write/compare, and submits with the caller-chosen io.slba; there is no race or layout dependency, so the same ioctl reliably performs the I/O.\nPR:L - nvme_open()/nvme_ns_chr_open() impose no capability check, and the vulnerable nvme_submit_io() path never called nvme_cmd_allowed(), the only CAP_SYS_ADMIN gate for partition and read-only-fd I/O. An unprivileged user who can open a partition or O_RDONLY NVMe node can issue the ioctl.\nUI:N - The attacker opens the NVMe node they already control and issues NVME_IOCTL_SUBMIT_IO themselves; no other user must mount media, pass a file, or otherwise act.\nS:U - Skipping nvme_cmd_allowed() lets the caller read and write other LBAs of the same NVMe namespace in the host kernel. That is intra-OS partition/fd-mode bypass, not a VM, IOMMU, or guest-to-host boundary crossing.\nC:H - On a partition bdev, nvme_ioctl() still uses bdev->bd_disk->private_data (the whole namespace) and nvme_submit_io() programs c.rw.slba from attacker io.slba without adding bd_start_sect, so nvme_cmd_read returns arbitrary namespace LBAs including other partitions.\nI:H - The same path accepts io.opcode=nvme_cmd_write and, because nvme_cmd_allowed() is not called, ignores NVME_IOCTL_PARTITION and !open_for_write, so the attacker can persist writes to any namespace LBA from a partition fd or an O_RDONLY descriptor.\nA:H - Those unscoped nvme_cmd_write commands can overwrite other partitions' metadata, swap, or the OS image on the same namespace, persistently denying use of the host or co-tenant volumes (the failure mode nvme_cmd_allowed() exists to prevent)."
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}