CVE-2026-64406: Bluetooth: fix UAF in bt_accept_dequeue()

mediumCVSS 5.5CVE-2026-64406

CSIRTS triage

vendor: null product: nullOther

What: A use-after-free vulnerability has been fixed in the bt_accept_dequeue() function.
Who is affected: Deployments using Bluetooth functionality are affected.
Urgency: Remediation is necessary to prevent potential exploitation, although exploitation status is currently unknown.
Action: Apply the fix for CVE-2026-64406.

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-2026-64406

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-2026-644060.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64406	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highCVE-2026-64406: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in bt_a…nvd

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 vulnerabilitiescert-bund · 2026-08-06
mediumCVE-2026-64409: Bluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()msrc · 2026-08-06
highCVE-2025-68304: Bluetooth: hci_core: lookup hci_conn on RX path on protocol sidemsrc · 2026-08-06
highCVE-2025-21969: Bluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmdmsrc · 2026-08-06
mediumCVE-2024-56591: Bluetooth: hci_conn: Use disable_delayed_work_syncmsrc · 2026-08-06
highCVE-2026-64405: Bluetooth: hci_conn: Fix null ptr deref in hci_abort_conn()msrc · 2026-08-06