CVE-2026-53147: thunderbolt: Validate XDomain request packet size before type cast

mediumCVSS 5.5CVE-2026-53147

CSIRTS triage

Other

What: This vulnerability involves validating XDomain request packet size before type casting.
Who is affected: Users of affected systems utilizing Thunderbolt.
Urgency: Remediation is necessary due to medium severity and potential for exploitation.
Action: Apply the relevant patches as soon as they are available.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53147

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-2026-531470.28% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53147	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownMultiple vulnerabilities in Microsoft Azure Linux (June 29, 2026)cert-fr-avis

Recent advisories for thunderbolt

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-2026-53148: thunderbolt: Clamp XDomain response data copy to allocation sizemsrc · 2026-06-09
mediumCVE-2026-53146: thunderbolt: Limit XDomain response copy to actual frame sizemsrc · 2026-06-09
highCVE-2026-53150: thunderbolt: Reject zero-length property entries in validatormsrc · 2026-06-09
mediumCVE-2026-53149: thunderbolt: Bound root directory content to block sizemsrc · 2026-06-09