What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-13 · updated 2026-08-03
• Weakness: CWE-401

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.

Affected products

• Linux kernel: from 6.16.4 before 6.18.35; from 6.19 before 7.0.12; 7.1-rc1, 7.1-rc2, 7.1-rc3, 7.1-rc4, 7.1-rc5 — fixed in 6.18.35, 7.0.12

How to fix

Upgrade to a fixed version: Linux kernel 6.18.35, 7.0.12. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/488e808e3fa53200f3ef3324c45fcba4ae9f4972
• https://git.kernel.org/stable/c/a59d4f4217e6200ca9180643e5738a87d3fa8be0
• https://git.kernel.org/stable/c/bfa9d28960ed677d556bdf097073bc3129686229
• https://git.kernel.org/stable/c/e6b78019664dfe37c3dc707f50e7b453d6c7726d

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