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CVE-2026-53209: Bluetooth: hci_sync: reject oversized Broadcast Announcement prepend

highCVSS 7CVE-2026-53209

CSIRTS triage

Other
What
This vulnerability involves rejecting oversized Broadcast Announcement prepend in Bluetooth.
Who is affected
Deployments using Bluetooth technology.
Urgency
Remediation is urgent due to the high severity rating.
Action
Apply the latest patches to mitigate this issue.

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

Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53209

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-2026-53209coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Bluetooth

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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