In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix memory leak in error path of hci_alloc_dev() Early failures in Bluetooth HCI UART configuration leak SRCU percpu memory. When device initialization fails before hci_register_dev() completes, the HCI_UNREGISTER flag is never set. As a result, when the device reference count reaches zero, bt_host_release() evaluates this flag as false and falls back to a direct kfree(hdev). Because hci_release_dev() is bypassed, the SRCU struct initialized early in hci_alloc_dev() is never cleaned up, resulting in a leak of percpu memory. Fix the leak by explicitly calling cleanup_srcu_struct() in the fallback (unregistered) branch of bt_host_release() before freeing the device.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/0622e527a31d4b44737fed5c1a2ac1fc2cfb5184 cve-icon
https://git.kernel.org/stable/c/37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f cve-icon
https://git.kernel.org/stable/c/5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd cve-icon
https://git.kernel.org/stable/c/bc2efe73c194a74839d7cf57b63880d97e21d309 cve-icon
https://git.kernel.org/stable/c/c016118b9e51eeaf5bc93850d4c455a3b583c0aa cve-icon
https://git.kernel.org/stable/c/ce4b4cac3c5749b6aa75e62e2991ae2263f2f889 cve-icon
https://git.kernel.org/stable/c/f82799407a50af7bcacacf09cc9b279af8fe9b81 cve-icon
https://lore.kernel.org/linux-cve-announce/2026062514-CVE-2026-53252-4306@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-53252 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-53252 cve-icon
History

Fri, 26 Jun 2026 15:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-687

Fri, 26 Jun 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-911
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Low

Thu, 25 Jun 2026 12:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-687

Thu, 25 Jun 2026 09:15:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix memory leak in error path of hci_alloc_dev() Early failures in Bluetooth HCI UART configuration leak SRCU percpu memory. When device initialization fails before hci_register_dev() completes, the HCI_UNREGISTER flag is never set. As a result, when the device reference count reaches zero, bt_host_release() evaluates this flag as false and falls back to a direct kfree(hdev). Because hci_release_dev() is bypassed, the SRCU struct initialized early in hci_alloc_dev() is never cleaned up, resulting in a leak of percpu memory. Fix the leak by explicitly calling cleanup_srcu_struct() in the fallback (unregistered) branch of bt_host_release() before freeing the device.
Title Bluetooth: fix memory leak in error path of hci_alloc_dev()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-06-25T08:39:43.951Z

Updated: 2026-06-25T08:39:43.951Z

Reserved: 2026-06-09T07:44:35.394Z

Link: CVE-2026-53252

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

Severity : Low

Publid Date: 2026-06-25T00:00:00Z

Links: CVE-2026-53252 - Bugzilla