CVE-2026-53071: Bluetooth: l2cap: Add missing chan lock in l2cap_ecred_reconf_rsp

CSIRTS triage

What

A missing channel lock in l2cap_ecred_reconf_rsp could lead to issues.

Who is affected

Deployments using Bluetooth functionalities.

Urgency

Remediation is important due to the high severity rating.

Action

Apply the relevant patches as they become available.

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-2026-53071

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-2026-530710.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 18% of all scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• unknownMultiple vulnerabilities in Microsoft Azure Linux (July 10, 2026)cert-fr-avis

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.

• medium[UPDATE] [medium] Linux Kernel (Bluetooth): Multiple vulnerabilities allow Denial of Servicecert-bund · 2026-07-06
• unknownCVE-2026-53358: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: use chan…nvd · 2026-07-02
• unknownCVE-2026-53357: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in l2ca…nvd · 2026-07-02
• unknownCVE-2026-13879: Chromium: CVE-2026-13879 Use after free in Bluetoothmsrc · 2026-07-02
• unknownCVE-2026-14035: Chromium: CVE-2026-14035 Insufficient policy enforcement in Bluetoothmsrc · 2026-07-02
• mediumCVE-2026-53357: Bluetooth: fix UAF in l2cap_sock_cleanup_listen() vs l2cap_conn_del()msrc · 2026-07-02

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