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CVE-2025-21949: LoongArch: Set hugetlb mmap base address aligned with pmd size

mediumCVSS 5.5CVE-2025-21949

CSIRTS triage

vendor: Linuxproduct: Linux kernel LoongArchMemory corruption
What
Hugetlb mmap base address is not aligned with pmd size on LoongArch architecture.
Who is affected
Systems running Linux kernel on LoongArch architecture with hugetlb in use.
Urgency
Medium severity with CVSS 5.5; not currently exploited but could cause alignment issues.
Action
Apply Linux kernel patch CVE-2025-21949 when available or update to a patched kernel version.

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-2025-21949

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-2025-21949coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for LoongArch

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.

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