CVE-2026-10656: The MAX32xxx USB device controller driver (drivers/usb/udc/udc_max32.c, compatible adi_max32_usbhs) dereferenc

Q: How do I fix CVE-2026-10656?

zephyr: upgrade to newer than 4.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-10656 being exploited?

CVE-2026-10656 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-10656 affect?

CVE-2026-10656 affects zephyr. Severity is medium (CVSS 4.6). The MAX32xxx USB device controller driver (drivers/usb/udc/udc_max32.c, compatible adi_max32_usbhs) dereferenced an endpoint buffer in its OUT and IN transfer-completion handlers without checking it for NULL. udc_event_xfer_out_done() calle

Q: How urgent is CVE-2026-10656?

Priority 26/100. Public exploit reference

Routine

MEDIUM 4.6UPGRADE

CVE-2026-10656 is a medium-severity flaw (CVSS 4.6) affecting zephyr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The MAX32xxx USB device controller driver (drivers/usb/udc/udc_max32.c, compatible adi_max32_usbhs) dereferenced an endpoint buffer in its OUT and IN transfer-completion handlers without checking it for NULL. udc_event_xfer_out_done() called net_buf_add(buf, ep_request->actlen) immediately after buf = udc_buf_get(ep_cfg), where udc_buf_get() returns NULL when the endpoint FIFO is empty. A transfer-completion event is queued from interrupt contex

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.6 (Medium)
Attack vector	Physical
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-476
Published	2026-07-05
Last modified	2026-10-25

Publisher (CNA): Zephyr Project · Vendor: zephyrproject

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-05 23:16 UTCPublished CVE record published
2026-10-25 15:10 UTCUpdated Record last modified

zephyrproject zephyr UPGRADE

Affected: >= 4.2.0 and <= 4.4.0

Fixed in: newer than 4.4.0

Safe to downgrade to: a release before 4.2.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-10656?

zephyr: upgrade to newer than 4.4.0. Exact commands for each OS are on this page.

Is CVE-2026-10656 being exploited?

CVE-2026-10656 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-10656 affect?

CVE-2026-10656 affects zephyr. Severity is medium (CVSS 4.6). The MAX32xxx USB device controller driver (drivers/usb/udc/udc_max32.c, compatible adi_max32_usbhs) dereferenced an endpoint buffer in its OUT and IN transfer-completion handlers without checking it for NULL. udc_event_xfer_out_done() calle

How urgent is CVE-2026-10656?

Priority 26/100. Public exploit reference

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References

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