CVE-2026-64557

Status: UPDATED  |  Advisory ID: CVE-2026-64557

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb()

l2cap_sock_new_connection_cb() returned l2cap_pi(sk)->chan after

release_sock(parent). Once the parent lock is dropped the newly

enqueued child socket sk is reachable via the accept queue, so another

task can accept and free it before the callback dereferences sk,

resulting in a use-after-free.

Rework the ->new_connection() op so the core, rather than the callback,

owns the child channel's lifetime. The op now receives a pre-allocated

new_chan and returns an errno instead of allocating and returning a

channel. l2cap_new_connection() allocates the child channel and links

it into the conn list via __l2cap_chan_add() before invoking the

callback, so the conn-list reference keeps the channel alive once

release_sock(parent) exposes the socket to other tasks.

Channel configuration that was duplicated in l2cap_sock_init() and the

various new_connection callbacks is consolidated into

l2cap_chan_set_defaults(), which now inherits from the parent channel

when one is supplied. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References