CVE-2026-80718: mm/percpu-km: fix bitmap overflow and accounting in pcpu_create_chunk()

mediumCVSS 5.5CVE-2026-80718

CSIRTS triage

vendor: Linux product: Linux Kernel Memory corruption

What: Bitmap overflow in pcpu_create_chunk() leads to incorrect percpu memory accounting.
Who is affected: All Linux kernel systems using percpu memory management.
Urgency: Medium severity; potential memory corruption without active exploitation reported.
Action: Apply kernel update addressing bitmap overflow in percpu-km.

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: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80718

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-2026-807180.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-80718	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 mm/percpu-km

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-2026-80718: In the Linux kernel, the following vulnerability has been resolved: mm/percpu-km: fix bitmap o…nvd · 2026-08-28