CVE-2026-53252 Details
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.
A memory leak vulnerability has been identified in the Bluetooth subsystem of the Linux kernel, specifically within the handling of HCI (Host Controller Interface) devices. This issue arises during the initialization of Bluetooth HCI UART configuration, where early failures can lead to a leak of per-CPU memory managed by the SRCU (Sleepable Read-Copy Update) mechanism. The problem occurs because the HCI_UNREGISTER flag is not set when initialization fails before the device is fully registered. Consequently, when the device reference count drops to zero, the cleanup process bypasses necessary memory management, leading to a persistent memory leak. The vulnerability affects several versions of the Linux kernel.
The vulnerability has been addressed by modifying the Bluetooth HCI device release process. The patch involves explicitly calling the 'cleanup_srcu_struct()' function in the 'bt_host_release()' function's fallback branch, which handles unregistered devices, before freeing the device memory. This change ensures that the SRCU struct is properly cleaned up, preventing the memory leak.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0622e527a31d4b44737fed5c1a2ac1fc2cfb5184 | kernel.org | Patch |
| https://git.kernel.org/stable/c/37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f | kernel.org | Patch |
| https://git.kernel.org/stable/c/5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd | kernel.org | Patch |
| https://git.kernel.org/stable/c/bc2efe73c194a74839d7cf57b63880d97e21d309 | kernel.org | Patch |
| https://git.kernel.org/stable/c/c016118b9e51eeaf5bc93850d4c455a3b583c0aa | kernel.org | Patch |
| https://git.kernel.org/stable/c/ce4b4cac3c5749b6aa75e62e2991ae2263f2f889 | kernel.org | Patch |
| https://git.kernel.org/stable/c/f82799407a50af7bcacacf09cc9b279af8fe9b81 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-401 | Missing Release of Memory after Effective Lifetime | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.10.259, < 5.11 >= 6.1.167, < 6.1.176 >= 6.6.97, < 6.6.143 >= 6.12.36, < 6.12.94 >= 6.15.5, < 6.16 >= 6.16.1, < 6.18.36 >= 6.19, < 7.0.13 5.15.209 6.16 - 6.16 rc4 6.16 rc5 6.16 rc6 6.16 rc7 7.1 rc1 7.1 rc2 7.1 rc3 7.1 rc4 7.1 rc5 7.1 rc6 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 8, 2026 | Initial Analysis | [email protected] |
| Jun 25, 2026 | New CVE Received | kernel.org |