CVE-2025-40065: RISC-V: KVM: Write hgatp register with valid mode bits

highCVSS 7.1CVE-2025-40065

CSIRTS triage

vendor: Linux product: Linux kernel Privilege escalation

What: RISC-V KVM incorrectly allows writing hgatp register without validating mode bits, enabling privilege escalation.
Who is affected: RISC-V systems running KVM virtual machines on affected kernels.
Urgency: High severity (CVSS 7.1); not exploited but direct privilege escalation vector.
Action: Apply kernel patch to validate hgatp mode bits on write.

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: high — CVSS 7.1
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40065

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-2025-400650.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2025-40065	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund

Recent advisories for RISC-V

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-2025-51678: An issue was discovered in RISC-V PicoRV32 commit 87c89a. A mismatch in the PCPI INSN and memo…nvd · 2026-07-17
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