CVE-2026-64017: blk-mq: pop cached request if it is usable

criticalCVSS 9.8CVE-2026-64017

CSIRTS triage

Other

What: A critical issue in blk-mq allows for cached requests to be improperly handled.
Who is affected: Deployments using affected blk-mq implementations.
Urgency: Remediation is critical urgency due to the high severity and potential for exploitation.
Action: Update to the latest kernel version that addresses this issue.

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

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: critical — CVSS 9.8
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64017

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-2026-640170.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64017	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 blk-mq

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-2026-64017: In the Linux kernel, the following vulnerability has been resolved: blk-mq: pop cached request…nvd · 2026-07-19