CVE-2026-68368: usb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb()

highCVSS 7.1CVE-2026-68368

CSIRTS triage

Denial of service Memory corruption

What: The Linux kernel USB gadget ncm driver fails to validate datagram bounds in ncm_unwrap_ntb(), allowing memory corruption or denial of service.
Who is affected: Linux systems with USB gadget mode enabled and the NCM network interface in use.
Urgency: High priority with CVSS 7.1; memory corruption via kernel USB driver warrants rapid remediation.
Action: Apply Linux kernel security updates addressing CVE-2026-68368 to systems with USB gadget functionality.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.1
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68368

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-683680.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-68368	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownCVE-2026-68368: In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: valida…nvd

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