CVE-2026-64406
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: fix UAF in bt_accept_dequeue()
bt_accept_get() takes a temporary reference before dropping the accept
queue lock. bt_accept_dequeue() currently drops that reference before
bt_accept_unlink(), leaving only the queue reference.
bt_accept_unlink() drops the queue reference. The subsequent
sock_hold() therefore accesses freed memory if it was the final
reference, as observed by KASAN during listening L2CAP socket cleanup.
Retain the temporary queue-walk reference through unlink and hand it to
the caller on success. Drop it explicitly on the closed and
not-yet-connected paths.
CSIRTS triage
- 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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Exploitation outlook
- Low exploitation risk0.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all EPSS-scored CVEs.
Advisory coverage (2)
- mediumCVE-2026-64406: Bluetooth: fix UAF in bt_accept_dequeue()msrc · 2026-08-06
- highCVE-2026-64406: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in bt_a…nvd · 2026-07-25
External references
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