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NVD / CVE Program· CNA Linux

CVE-2026-80861: usb: xhci: bail out of setup if the controller is inaccessible

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.18% (FIRST EPSS).
  • Fixed version: Linux Linux 0b31744f70c5e06cce5fb660e02d057a3b9e0e37, 15e62f969fecf459a0b873004cc5f4c5a6ba5fcc, 301f4a3303b21ea959a8294518ee883710498ac2; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 0b31744f70c5e06cce5fb660e02d057a3b9e0e37, 15e62f969fecf459a0b873004cc5f4c5a6ba5fcc, 301f4a3303b21ea959a8294518ee883710498ac2; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Sep 4, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.31affected
    • 66d4eadd8d067269ea8fead1a50fe87c2979a80d and later · before 9f8b403d5f8c1ac361533c73fa449153a3c7fc6caffected · git
    • 66d4eadd8d067269ea8fead1a50fe87c2979a80d and later · before 15e62f969fecf459a0b873004cc5f4c5a6ba5fccaffected · git
    • 66d4eadd8d067269ea8fead1a50fe87c2979a80d and later · before 99e78b54cc3d70e008bd1a30d43e13d652c773e0affected · git
    • 66d4eadd8d067269ea8fead1a50fe87c2979a80d and later · before 301f4a3303b21ea959a8294518ee883710498ac2affected · git
    • 66d4eadd8d067269ea8fead1a50fe87c2979a80d and later · before 70706dbcf122940f4e3595d7ba1445004cc00074affected · git
    • 66d4eadd8d067269ea8fead1a50fe87c2979a80d and later · before c051f66b621695ad7c8438a9497d79e1f4f05edbaffected · git
    • 66d4eadd8d067269ea8fead1a50fe87c2979a80d and later · before bf84c6b0264947794fa783c324a6d874ca6657d8affected · git
    • 66d4eadd8d067269ea8fead1a50fe87c2979a80d and later · before 0b31744f70c5e06cce5fb660e02d057a3b9e0e37affected · git
    • 66d4eadd8d067269ea8fead1a50fe87c2979a80d and later · before 78203d5b54a40f0e36196ebf31c9c7a380fc8811affected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.1.13-17.1.13-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-80859Sep 4, 2026 · fuse: fix missing barrier when checking io-uring readiness
    0Monitor
  • ← EarlierCVE-2026-80860Sep 4, 2026 · fuse: fix race between interrupt and resend
    0Monitor
  • Later →CVE-2026-80862Sep 4, 2026 · nvme-tcp: fix usage of page_frag_cache
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0b31744f70c5e06cce5fb660e02d057a3b9e0e37Vendor (CNA)
Linux Linux15e62f969fecf459a0b873004cc5f4c5a6ba5fccVendor (CNA)
Linux Linux301f4a3303b21ea959a8294518ee883710498ac2Vendor (CNA)
Linux Linux70706dbcf122940f4e3595d7ba1445004cc00074Vendor (CNA)
Linux Linux78203d5b54a40f0e36196ebf31c9c7a380fc8811Vendor (CNA)
Linux Linux99e78b54cc3d70e008bd1a30d43e13d652c773e0Vendor (CNA)
Linux Linux9f8b403d5f8c1ac361533c73fa449153a3c7fc6cVendor (CNA)
Linux Linuxbf84c6b0264947794fa783c324a6d874ca6657d8Vendor (CNA)
Linux Linuxc051f66b621695ad7c8438a9497d79e1f4f05edbVendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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