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CVE-2026-31499: Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()

mediumCVSS 5.5CVE-2026-31499

CSIRTS triage

product: Linux kernel Bluetooth L2CAPOther
What
A deadlock issue in the l2cap_conn_del() function in the Bluetooth L2CAP layer.
Who is affected
Systems with Bluetooth connectivity using the L2CAP protocol.
Urgency
Medium urgency; deadlock can cause system hangs or service disruption.
Action
Apply the Linux kernel patch fixing the l2cap_conn_del() deadlock.

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-2026-31499

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-2026-31499coverage & 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.

More from Microsoft Security Response Center