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CVE-2026-53364— Bluetooth: hci_conn: Fix memory leak in hci_le_big_terminate()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于蓝牙hci_conn中hci_le_big_terminate()函数内存泄漏问题，在评估PA和BIG同步连接状态后，当未设置pa_sync_term或big_sync_term标志时，函数分配iso_list_data后直接返回0而未释放内存，可能导致内存泄漏。

AI Predicted 5.3 Difficulty: Easy EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 11

VendorProduct Version RangeStatus
Linux Linux a8444cca514edd4e47e322926b10516a5a6d7016< 488e808e3fa53200f3ef3324c45fcba4ae9f4972 affected
a7bcffc673de219af2698fbb90627016233de67b< e6b78019664dfe37c3dc707f50e7b453d6c7726d affected
a7bcffc673de219af2698fbb90627016233de67b< a59d4f4217e6200ca9180643e5738a87d3fa8be0 affected
a7bcffc673de219af2698fbb90627016233de67b< bfa9d28960ed677d556bdf097073bc3129686229 affected
087812a6119b4cd5c9d658b48aee40a25707a1c6 affected
6.16.4< 6.17 affected
6.17 affected
< 6.17 unaffected
… +3 more rows
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I. Basic Information for CVE-2026-53364

Vulnerability Information
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Vulnerability Title
Bluetooth: hci_conn: Fix memory leak in hci_le_big_terminate()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: Fix memory leak in hci_le_big_terminate() hci_le_big_terminate() allocates iso_list_data via kzalloc_obj but returns 0 without freeing it when neither pa_sync_term nor big_sync_term flags are set after evaluating the PA and BIG sync connection state. This early-return path was introduced when hci_le_big_terminate() was refactored to take struct hci_conn instead of raw u8 parameters, adding PA/BIG flag evaluation logic. The existing kfree() on hci_cmd_sync_queue failure does not cover this path.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于蓝牙hci_conn中hci_le_big_terminate()函数内存泄漏问题，在评估PA和BIG同步连接状态后，当未设置pa_sync_term或big_sync_term标志时，函数分配iso_list_data后直接返回0而未释放内存，可能导致内存泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux a8444cca514edd4e47e322926b10516a5a6d7016 ~ 488e808e3fa53200f3ef3324c45fcba4ae9f4972 -
Linux Linux 6.17 -

II. Public POCs for CVE-2026-53364

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III. Intelligence Information for CVE-2026-53364

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Patches & Fixes for CVE-2026-53364 (2)

Other References for CVE-2026-53364 (1)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53364

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