CVE-2026-10668

MEDIUMNVD 4.64.6—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.6 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 86% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
4.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.6Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The Nuvoton NuMaker HSUSBD USB device-controller driver (drivers/usb/udc/udc_numaker.c) armed the control Data IN stage unconditionally (base->CEPTXCNT = len in numaker_hsusbd_ep_trigger). Because the HSUSBD hardware cannot disarm a control Data IN already armed for a previous transfer, a USB host that cancels an in-flight control transfer (timeout) and then issues a new SETUP packet can drive the driver out of sync: stale data may be transmitted in the new transfer and the control endpoint can become permanently stuck NAK'ing every subsequent control transfer.

A malicious or buggy host (physical/adjacent attacker driving the bus) can repeatedly cancel-and-re-SETUP to wedge the device's USB control endpoint, denying service to the device's USB function (the device stops enumerating/responding on the control pipe) until a USB reset or re-plug. The flaw is an availability-only denial of service; the FIFO copy loops (bounded by net_buf length and the hardware BUFFULL flag) and the net_buf lifecycle are independent of the arming desync, so there is no out-of-bounds access, use-after-free, or information leak.

The fix monitors the IN-token and new-SETUP events (k_event) and only arms control Data IN when an IN token is present and no new SETUP has arrived, cancelling the current transfer on a new SETUP. Affects boards using the Nuvoton NuMaker HSUSBD controller (CONFIG_UDC_NUMAKER with DT_HAS_NUVOTON_NUMAKER_HSUSBD_ENABLED); shipped in v4.4.0.

CVSS v3
4.6
EG Score
4.6(medium)
EG Risk
21(Track)
EG Risk 21/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity46% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

July 12, 2026

Last Modified

July 16, 2026

Advisory Details (2)

Auto-updated Jul 19, 2026
Patch available. Sources: github, github_commit.
github Patch Available

Host-triggerable control-endpoint wedge (DoS) in Nuvoton NuMaker HSUSBD UDC driver · Advisory · zephyrproject-rtos/zephyr · GitHub

https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-rm28-x84j-4qrx
github_commit

commit 48e003326873 (zephyrproject-rtos/zephyr)

Fix landed in zephyrproject-rtos/zephyr commit 48e003326873 — awaiting tagged release

https://github.com/zephyrproject-rtos/zephyr/commit/48e003326873e8bbc0ee4b67334e0dd8b5fb890f

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 51× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-30 05:44 UTCEG score recompute
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  49. 2026-07-17 08:24 UTCEG score recompute▲ 2.20
  50. 2026-07-16 20:22 UTCNVD updateCVSS v3 → 4.6 · severity → MEDIUM
  51. 2026-07-16 17:02 UTCEPSS rescore
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  55. 2026-07-12 16:38 UTCEG score recompute
  56. 2026-07-12 16:37 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-10668?
CVE-2026-10668 is a medium vulnerability published on July 12, 2026. The Nuvoton NuMaker HSUSBD USB device-controller driver (drivers/usb/udc/udcnumaker.c) armed the control Data IN stage unconditionally (base->CEPTXCNT = len in numakerhsusbdeptrigger). Because the HSUSBD hardware cannot disarm a control Data IN already armed for a previous transfer, a USB host that…
When was CVE-2026-10668 disclosed?
CVE-2026-10668 was first published in the National Vulnerability Database on July 12, 2026, with the most recent update on July 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-10668 actively exploited?
CVE-2026-10668 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 86.3% of all scored CVEs.
What is the CVSS score of CVE-2026-10668?
CVE-2026-10668 has a CVSS v3 base score of 4.6 (NVD).
How do I remediate CVE-2026-10668?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-10668, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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