CVE-2026-64070: powerpc/hv-gpci: fix preempt count leak in sysfs show paths

criticalCVSS 9.8CVE-2026-64070

CSIRTS triage

Other

What: The powerpc hv-gpci may leak preempt count in sysfs show paths.
Who is affected: Deployments using powerpc hv-gpci.
Urgency: Remediation is high urgency due to the critical severity of the issue.
Action: Apply the patch for CVE-2026-64070.

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-2026-64070

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-2026-640700.15% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64070	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highUSN-8618-1: Linux kernel vulnerabilitiesubuntu
highUSN-8603-1: Linux kernel (Azure) vulnerabilitiesubuntu
highUSN-8593-1: Linux kernel vulnerabilitiesubuntu
unknownCVE-2026-64070: In the Linux kernel, the following vulnerability has been resolved: powerpc/hv-gpci: fix preem…nvd

Recent advisories for powerpc/hv-gpci

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.

unknownCVE-2026-64070: In the Linux kernel, the following vulnerability has been resolved: powerpc/hv-gpci: fix preem…nvd · 2026-07-19