CVE-2026-80861
Estado: RecibidaSin puntuar—
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:
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:
Leer descripción completaMostrar menos
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.
Detalles técnicos trazas, registros y código del informe original
xhci->op_regs = hcd->regs +
HC_LENGTH(readl(&xhci->cap_regs->hc_capbase));
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_probeCVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/0b31744f70c5e06cce5fb660e02d057a3b9e0e37
- 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/bf84c6b0264947794fa783c324a6d874ca6657d8
- https://git.kernel.org/stable/c/c051f66b621695ad7c8438a9497d79e1f4f05edb
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-80861",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "66d4eadd8d067269ea8fead1a50fe87c2979a80d",
"lessThan": "301f4a3303b21ea959a8294518ee883710498ac2",
"versionType": "git"
},
{
"status": "affected",
"version": "66d4eadd8d067269ea8fead1a50fe87c2979a80d",
"lessThan": "70706dbcf122940f4e3595d7ba1445004cc00074",
"versionType": "git"
},
{
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"lessThan": "c051f66b621695ad7c8438a9497d79e1f4f05edb",
"versionType": "git"
},
{
"status": "affected",
"version": "66d4eadd8d067269ea8fead1a50fe87c2979a80d",
"lessThan": "bf84c6b0264947794fa783c324a6d874ca6657d8",
"versionType": "git"
},
{
"status": "affected",
"version": "66d4eadd8d067269ea8fead1a50fe87c2979a80d",
"lessThan": "0b31744f70c5e06cce5fb660e02d057a3b9e0e37",
"versionType": "git"
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{
"status": "affected",
"version": "66d4eadd8d067269ea8fead1a50fe87c2979a80d",
"lessThan": "78203d5b54a40f0e36196ebf31c9c7a380fc8811",
"versionType": "git"
}
],
"programFiles": [
"drivers/usb/host/xhci.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.31"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.31",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.13",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2.3",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/usb/host/xhci.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-04T16:18:15.290",
"references": [
{
"url": "https://git.kernel.org/stable/c/0b31744f70c5e06cce5fb660e02d057a3b9e0e37",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/301f4a3303b21ea959a8294518ee883710498ac2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/70706dbcf122940f4e3595d7ba1445004cc00074",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/78203d5b54a40f0e36196ebf31c9c7a380fc8811",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/bf84c6b0264947794fa783c324a6d874ca6657d8",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c051f66b621695ad7c8438a9497d79e1f4f05edb",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"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->op_regs = hcd->regs +\n\t\tHC_LENGTH(readl(&xhci->cap_regs->hc_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() -> xhci_handshake() reading op_regs->status, 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."
}
],
"lastModified": "2026-10-03T11:17:40.657",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}