Information disclosure in Linux kernel - CVE-2026-64127
Published: July 20, 2026
Vulnerability identifier: #VU138510
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-64127
CWE-ID: CWE-200
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 disclose sensitive information.
The vulnerability exists due to an information leak caused by incorrect size and source-pointer arguments in l2cap_ecred_reconfigure() in the Bluetooth L2CAP subsystem when sending an L2CAP_ECRED_RECONFIGURE_REQ packet to a paired Bluetooth peer. A remote attacker can trigger ecred reconfiguration handling to disclose sensitive information.
The malformed packet copies bytes from kernel stack memory and can expose a kernel stack address to the peer. Exploitation requires Bluetooth connectivity with a paired peer.
How to mitigate CVE-2026-64127
Install security update from vendor's repository.