CVE-2026-43309: md raid: fix hang when stopping arrays with metadata through dm-raid

mediumCVSS 5.5CVE-2026-43309

CSIRTS triage

vendor: Linux product: Linux Kernel Denial of service

What: A hang condition occurs when stopping RAID arrays with metadata through dm-raid.
Who is affected: Systems using md RAID with dm-raid and metadata are affected when stopping arrays.
Urgency: Moderate; CVSS 5.5 indicates medium severity denial of service risk.
Action: Apply the Linux kernel patch that fixes the hang condition in md RAID dm-raid stop logic.

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-2026-43309

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-2026-433090.12% 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-2026-43309	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

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

Recent advisories for md raid

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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