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CVE-2026-63944

kernel: Bluetooth: hci_sync: fix UAF in hci_le_create_cis_sync

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Severity

Moderate

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · July 19, 2026

Updated · October 29, 2026

Description

A flaw was found in the Linux kernel's Bluetooth subsystem. This vulnerability, a Use-After-Free (UAF), allows an attacker to access memory after it has been freed. This can lead to a system crash, resulting in a Denial of Service (DoS), or potentially enable an attacker to execute malicious code. The flaw occurs due to improper handling of connection timeouts during concurrent disconnections.

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