CVE-2026-80861 (GCVE-0-2026-80861)
Vulnerability from cvelistv5
Published
2026-09-04 15:55
Modified
2026-10-19 08:44
Severity ?
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 probe path. Read the capability register once, and if it reads back the all-ones value (as xhci_handshake() and xhci_reset() already test for), abort setup with -ENODEV before op_regs is derived from it. Reading it once also avoids re-reading a register that may change under a concurrent hot-removal.
References
Impacted products
Vendor Product Version
Linux Linux Version: 66d4eadd8d067269ea8fead1a50fe87c2979a80d
Version: 66d4eadd8d067269ea8fead1a50fe87c2979a80d
Version: 66d4eadd8d067269ea8fead1a50fe87c2979a80d
Version: 66d4eadd8d067269ea8fead1a50fe87c2979a80d
Version: 66d4eadd8d067269ea8fead1a50fe87c2979a80d
Version: 66d4eadd8d067269ea8fead1a50fe87c2979a80d
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/host/xhci.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/host/xhci.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.31"
            },
            {
              "lessThan": "2.6.31",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.3",
              "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": "6.6.158",
                  "versionStartIncluding": "2.6.31",
                  "vulnerable": true
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
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                  "vulnerable": true
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: xhci: bail out of setup if the controller is inaccessible\n\nxhci_gen_setup() locates the operational registers using the capability\nlength read from the very first register:\n\n\txhci-\u003eop_regs = hcd-\u003eregs +\n\t\tHC_LENGTH(readl(\u0026xhci-\u003ecap_regs-\u003ehc_capbase));\n\nIf the controller is dead or has dropped off the bus, that read returns\n~0, HC_LENGTH() truncates it to 0xff, and op_regs ends up 0xff bytes\npast the page-aligned MMIO base, i.e. unaligned. The first access\nthrough it, xhci_halt() -\u003e xhci_handshake() reading op_regs-\u003estatus, is\nthen an unaligned readl() on device memory. arm64 faults on unaligned\ndevice accesses, so instead of xhci_handshake() catching the all-ones\nvalue and returning -ENODEV, setup oopses:\n\n  xhci-pci-renesas 0005:08:00.0: Unable to change power state from D3cold to D0, device inaccessible\n  xhci-pci-renesas 0005:08:00.0: xHCI Host Controller\n  xhci-pci-renesas 0005:08:00.0: new USB bus registered, assigned bus number 1\n  Unable to handle kernel paging request at virtual address ffff80030a770103\n    ESR = 0x0000000096000021\n    FSC = 0x21: alignment fault\n  Internal error: Oops: 0000000096000021 [#1]  SMP\n  pc : xhci_halt [xhci_hcd]\n  Call trace:\n   xhci_halt\n   xhci_gen_setup\n   xhci_pci_setup\n   usb_add_hcd\n   usb_hcd_pci_probe\n   xhci_pci_common_probe\n   xhci_pci_renesas_probe\n\nThis was hit with a Renesas uPD720201 that failed to power up (\"Unable\nto change power state from D3cold to D0, device inaccessible\") yet still\nreached the HCD probe path.\n\nRead the capability register once, and if it reads back the all-ones\nvalue (as xhci_handshake() and xhci_reset() already test for), abort\nsetup with -ENODEV before op_regs is derived from it. Reading it once\nalso avoids re-reading a register that may change under a concurrent\nhot-removal."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:44:55.319Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/301f4a3303b21ea959a8294518ee883710498ac2"
        },
        {
          "url": "https://git.kernel.org/stable/c/70706dbcf122940f4e3595d7ba1445004cc00074"
        },
        {
          "url": "https://git.kernel.org/stable/c/c051f66b621695ad7c8438a9497d79e1f4f05edb"
        },
        {
          "url": "https://git.kernel.org/stable/c/bf84c6b0264947794fa783c324a6d874ca6657d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b31744f70c5e06cce5fb660e02d057a3b9e0e37"
        },
        {
          "url": "https://git.kernel.org/stable/c/78203d5b54a40f0e36196ebf31c9c7a380fc8811"
        }
      ],
      "title": "usb: xhci: bail out of setup if the controller is inaccessible",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80861",
    "datePublished": "2026-09-04T15:55:15.491Z",
    "dateReserved": "2026-08-26T14:34:25.798Z",
    "dateUpdated": "2026-10-19T08:44:55.319Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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