CVE-2026-64191: i2c: stub: Reject I2C block transfers with invalid length

highCVSS 7.8CVE-2026-64191

CSIRTS triage

What: Invalid length I2C block transfers are now rejected.
Who is affected: No specific deployments or versions are mentioned.
Urgency: The urgency is high with a CVSS score of 7.8.
Action: Apply the relevant patches for CVE-2026-64191.

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 7.8
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64191

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-2026-641910.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64191	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 i2c

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.

lowCVE-2026-10683: In the Synopsys DesignWare I2C driver (drivers/i2c/i2c_dw.c) operating in target/slave mode, t…nvd · 2026-07-27
highCVE-2026-64279: In the Linux kernel, the following vulnerability has been resolved: i2c: core: fix adapter der…nvd · 2026-07-25
unknownCVE-2026-64278: In the Linux kernel, the following vulnerability has been resolved: i2c: imx-lpi2c: mark I2C a…nvd · 2026-07-25
unknownCVE-2026-64275: In the Linux kernel, the following vulnerability has been resolved: Input: elan_i2c - prevent …nvd · 2026-07-25
unknownCVE-2026-64237: In the Linux kernel, the following vulnerability has been resolved: Input: elan_i2c - validate…nvd · 2026-07-24
unknownCVE-2026-64236: In the Linux kernel, the following vulnerability has been resolved: i2c: davinci: fix division…nvd · 2026-07-24