CVE-2026-64318: partitions: aix: bound the pp_count scan to the ppe array

mediumCVSS 5.5CVE-2026-64318

CSIRTS triage

vendor: Linux product: KernelOther

What: This vulnerability involves bounding the pp_count scan to the ppe array in AIX partitions.
Who is affected: Deployments of the Linux kernel with AIX partitions are affected.
Urgency: Remediation is necessary to prevent potential issues, though exploitation is not confirmed.
Action: Apply the latest kernel patches that address this issue.

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: medium — CVSS 5.5
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64318

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-2026-643180.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64318	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highCVE-2026-64318: In the Linux kernel, the following vulnerability has been resolved: partitions: aix: bound the…nvd

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