Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-63975
Published: July 20, 2026
Vulnerability identifier: #VU138677
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-63975
CWE-ID: CWE-670
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper handling of channel deletion during list iteration in l2cap_ecred_conn_rsp in the Bluetooth L2CAP subsystem when processing a crafted L2CAP credit-based connection response with an already-assigned destination CID. A remote attacker can send a specially crafted Bluetooth packet to cause a denial of service.
The issue occurs when a duplicate destination CID is received for an L2CAP extended credit based connection response.
How to mitigate CVE-2026-63975
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/291eec1041c918c460dc9702e44edd17794b4a4b
- https://git.kernel.org/stable/c/3c8eaa91eb433c450426539290be4ffe282e9f00
- https://git.kernel.org/stable/c/41c2713b204e6cb6a94587bc6bf6935107df5479
- https://git.kernel.org/stable/c/41e29548b5e8b5e5fcf708786b3bea67cab107fa
- https://git.kernel.org/stable/c/6319b38fe69f56ed95680ade485b957a53fff642
- https://git.kernel.org/stable/c/d153b8898c0051eb8b6a083b35cbe304a5886bd5
- https://git.kernel.org/stable/c/e6833e737a51db1e5ea0401322acf5e22abd8be6
- https://git.kernel.org/stable/c/ecfed1e0d8efecad6737a0d83e21d2fd021d8c48