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CVE-2026-64434

kernel: Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref

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Severity

Important

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · July 25, 2026

Updated · August 5, 2026

Description

A flaw was found in the Linux kernel's Bluetooth L2CAP (Logical Link Control and Adaptation Protocol) component. An asynchronous operation in the l2cap_chan_timeout() function can attempt to access a connection that has already been deallocated. This use-after-free vulnerability could allow a local attacker to cause a denial of service or potentially execute arbitrary code.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-364 · Signal Handler Race Condition