usb: xhci: bail out of setup if the controller is inaccessible

{
  "id": "c2e3ac0cd23d2ea8608ee325d57b6f168eaa31d2efc77d9989b8fe13d757cb0f",
  "url": "https://osv.dev/vulnerability/CVE-2026-80861",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "usb: xhci: bail out of setup if the controller is inaccessible",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: usb: xhci: bail out of setup if the controller is inaccessible xhci_gen_setup() locates the operational registers using the capability length read from the very first register: xhci->op_regs = hcd->regs + HC_LENGTH(readl(&xhci->cap_regs->hc_capbase)); If the controller is dead or has dropped off the bus, that read returns ~0, HC_LENGTH() truncates it to 0xff, and op_regs ends up 0xff bytes past the page-aligned MMIO base, i.e. unaligned. The first access through it, xhci_halt() -> xhci_handshake() reading op_regs->status, is then an unaligned readl() on device memory. arm64 faults on unaligned device accesses, so instead of xhci_handshake() catching the all-ones value and returning -ENODEV, setup oopses: xhci-pci-renesas 0005:08:00.0: Unable to change power state from D3cold to D0, device inaccessible xhci-pci-renesas 0005:08:00.0: xHCI Host Controller xhci-pci-renesas 0005:08:00.0: new USB bus registered, assigned bus number 1 Unable to handle kernel paging request at virtual address ffff80030a770103 ESR = 0x0000000096000021 FSC = 0x21: alignment fault Internal error: Oops: 0000000096000021 [#1] SMP pc : xhci_halt [xhci_hcd] Call trace: xhci_halt xhci_gen_setup xhci_pci_setup usb_add_hcd usb_hcd_pci_probe xhci_pci_common_probe xhci_pci_renesas_probe This was hit with a Renesas uPD720201 that failed to power up (\"Unable to change power state from D3cold to D0, device inaccessible\") yet still reached the HCD p",
    "evidence": "osv:CVE-2026-80861",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.10.273",
            "evidence": "/affected/1/ranges"
          },
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            "value": "5.15.224",
            "evidence": "/affected/1/ranges"
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            "value": "6.1.191",
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-80861",
      "aliases": [
        "CVE-2026-80861"
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      "affected": [
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          "package": {
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            "ecosystem": "Linux"
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      "modified": "2026-11-01T02:30:33.540540393Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0b31744f70c5e06cce5fb660e02d057a3b9e0e37",
        "https://git.kernel.org/stable/c/15e62f969fecf459a0b873004cc5f4c5a6ba5fcc",
        "https://git.kernel.org/stable/c/301f4a3303b21ea959a8294518ee883710498ac2",
        "https://git.kernel.org/stable/c/70706dbcf122940f4e3595d7ba1445004cc00074",
        "https://git.kernel.org/stable/c/78203d5b54a40f0e36196ebf31c9c7a380fc8811",
        "https://git.kernel.org/stable/c/99e78b54cc3d70e008bd1a30d43e13d652c773e0",
        "https://git.kernel.org/stable/c/9f8b403d5f8c1ac361533c73fa449153a3c7fc6c",
        "https://git.kernel.org/stable/c/bf84c6b0264947794fa783c324a6d874ca6657d8",
        "https://git.kernel.org/stable/c/c051f66b621695ad7c8438a9497d79e1f4f05edb",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80861.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80861",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80861.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-80861",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 489272,
  "published_at": "2026-09-04T15:55:15.491+00:00"
}