CVE-2026-68124: mctp: serial: handle zero-length frames to prevent rx buffer overflow

highCVSS 7.7CVE-2026-68124

CSIRTS triage

vendor: Linux product: Linux kernel Memory corruption

What: Zero-length frame handling in MCTP serial transport causes receive buffer overflow.
Who is affected: Systems using MCTP (Management Component Transport Protocol) over serial interfaces.
Urgency: High severity; buffer overflow can enable denial of service or privilege escalation on systems with MCTP enabled.
Action: Apply the latest Linux kernel patch addressing CVE-2026-68124.

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

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.7
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68124

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-2026-681240.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 27% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-68124	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

Recent advisories for mctp

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-68314: In the Linux kernel, the following vulnerability has been resolved: net: mctp i3c: clean up no…nvd · 2026-08-10
criticalCVE-2026-68124: In the Linux kernel, the following vulnerability has been resolved: mctp: serial: handle zero-…nvd · 2026-08-10
highCVE-2026-10678: The MCTP-over-I2C+GPIO target binding in Zephyr (subsys/pmci/mctp/mctp_i2c_gpio_target.c) proc…nvd · 2026-07-21
highCVE-2026-63874: In the Linux kernel, the following vulnerability has been resolved: net: mctp: usb: fix race b…nvd · 2026-07-19