Use-after-free in Linux kernel - CVE-2026-53357
Published: July 2, 2026
Vulnerability identifier: #VU136810
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-53357
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in l2cap_sock_cleanup_listen() and bt_accept_dequeue() in the Bluetooth L2CAP socket handling code when racing listen socket cleanup with a concurrent HCI disconnect. A local user can trigger a listen/close versus HCI-disconnect race to cause a denial of service.
The issue occurs during cleanup of not-yet-accepted child sockets on a listening socket.
How to mitigate CVE-2026-53357
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/407217734835d21d4e0105ebf347860dc1806f88
- https://git.kernel.org/stable/c/5d86d2f1b4d9a508c441d3e45277ae1a73cfed57
- https://git.kernel.org/stable/c/751de6ec671fe75ad9cf65a0638d2a06b6a5984d
- https://git.kernel.org/stable/c/7eebd4c2c86f573af87ff165d08a83432eb0b919
- https://git.kernel.org/stable/c/87c543e2f78d0871f271df92dab98901bbd5b6f5
- https://git.kernel.org/stable/c/a5ca86a6097a8b030ca3226cd300b17ed330f966
- https://git.kernel.org/stable/c/ab1513597c6cf17cd1ad2a21e3b045421b48e022
- https://git.kernel.org/stable/c/added1213395071470a900cc845a042fb51882a6