CVE-2026-53384: serial: 8250_dw: unregister 8250 port if clk_notifier_register() fails

criticalCVSS 9.8CVE-2026-53384

CSIRTS triage

vendor: KVM product: KVMOther

What: The vulnerability involves unregistering the 8250 port if the clock notifier registration fails.
Who is affected: Deployments of KVM that use the 8250_dw serial driver.
Urgency: Remediation is necessary to avoid potential resource leaks.
Action: Update to the latest version of KVM.

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: critical — CVSS 9.8
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53384

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-2026-533840.49% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53384	coverage & exploitation status	NVD · CVE.org

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