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CVE-2026-31575: mm/userfaultfd: fix hugetlb fault mutex hash calculation

mediumCVSS 5.5CVE-2026-31575

CSIRTS triage

vendor: Linuxproduct: Linux KernelDenial of service
What
Userfaultfd hugetlb fault mutex hash calculation is incorrect causing synchronization failures.
Who is affected
Systems using userfaultfd with hugetlb page handling.
Urgency
Medium severity; incorrect hash calculation can cause deadlocks or race conditions but not currently exploited.
Action
Apply patch correcting hugetlb fault mutex hash calculation in userfaultfd.

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
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31575

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-31575coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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