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A use-after-release reference leak vulnerability was identified and fixed in the Linux kernel's Bluetooth L2CAP subsystem. The flaw involved a missing reference release in the l2cap_chan_timeout() function when the channel connection pointer was NULL, causing a reference leak. This issue has been addressed in updated Linux kernel versions. The vulnerability is rated medium severity and affects multiple linux-hwe-edge kernel versions prior to 7.0.0-28.28~24.04.1 and related builds. No known exploits are reported in the wild. Users should apply the official kernel updates and reboot to remediate the issue.

The Linux kernel Bluetooth L2CAP subsystem contained a vulnerability (CVE-2026-63948) where the function l2cap_chan_timeout() failed to release a channel reference if the channel's connection pointer was NULL, resulting in a reference leak. The function __set_chan_timer() acquires a reference via l2cap_chan_hold() before scheduling delayed work, but the early return path in l2cap_chan_timeout() skipped the corresponding l2cap_chan_put(), leaking the reference. This flaw has been fixed by adding the missing l2cap_chan_put() call before the early return. The issue affects linux-hwe-edge kernel versions prior to 7.0.0-28.28~24.04.1 and related versions. The vendor has released patches to address this vulnerability.

Detailed information about Linux hwe edge: (In the Linux kernel, the following vulnerability has been resolved: B ...) affecting null linux-hwe-edge. Get real-t

Linux hwe edge: (In the Linux kernel, the following vulnerability has been resolved: B ...) - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn… (CVE-2026-63948)

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