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CVE-2026-13213— Bluetooth HAS: NULL-pointer dereference DoS when a bonded peer reconnects before bt_has_register

Quick assessment

Affected
zephyrproject zephyr
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.

以下是对该漏洞描述信息的中文翻译： 在 文件中，Hearing Access Service (HAS) GATT 服务器无条件地通过 安装了连接回调。这意味着，即使应用程序尚未调用 ，只要建立了安全性连接， 函数就会运行。在服务属性指针 、 和 被 解析并设置 标志之前，这些指针始终保持为 NULL（空指针）。 当启用 配置时， 会在系统启动时恢复每个已配对客户端的持久化上下文，并无条件地将 设置为 （非零值）。如果此前已配对的 peer 在 被调用之前的启动窗口期内重新连接并重新建立安全性， 函数会检测到非零标

CVSS 5.3 · Medium
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I. Basic Information for CVE-2026-13213

Vulnerability Information
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Vulnerability Title
Bluetooth HAS: NULL-pointer dereference DoS when a bonded peer reconnects before bt_has_register
Source: CVE Program / CVE List V5
Vulnerability Description
The Hearing Access Service (HAS) GATT server in subsys/bluetooth/audio/has.c installs a connection-callback set unconditionally via BT_CONN_CB_DEFINE, so security_changed() runs for every connection that establishes security even before the application has called bt_has_register(). The service attribute pointers hearing_aid_features_attr, preset_control_point_attr, and active_preset_index_attr remain NULL until bt_has_register() resolves them and sets has.registered. With CONFIG_BT_SETTINGS, settings_set_cb() restores each bonded client's persisted context at boot and unconditionally sets context->flags to BONDED_CLIENT_INIT_FLAGS (non-zero). When a previously bonded peer reconnects and re-establishes security during the startup window before bt_has_register() has been called, security_changed() sees the non-zero flags and schedules notify_work_handler, which calls bt_gatt_is_subscribed() with a still-NULL attribute pointer. That triggers an assertion (__ASSERT(attr, ...) in bt_gatt_is_subscribed()), or a NULL dereference of attr->uuid when assertions are compiled out. The result is a remotely triggerable (Bluetooth, adjacent) crash of the HAS peripheral. Exploitation requires the peer to have previously bonded with the device and to reconnect within the boot-time race window before the application registers the service; a peer that reconnects persistently can prolong the outage. Impact is denial of service only, with no memory corruption or information disclosure. The fix adds an early if (!has.registered) { return; } guard in security_changed(), so no notification work is scheduled until the GATT service is registered and its attribute pointers are valid.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
zephyrproject zephyr 3.6.0 ~ 4.4.2 -

II. Public POCs for CVE-2026-13213

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III. Intelligence Information for CVE-2026-13213

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Patches & Fixes for CVE-2026-13213 (1)

Vendor Advisories for CVE-2026-13213 (1)

Same Patch Batch · zephyrproject · 2026-08-24 · 4 CVEs total

CVE-2026-13212 8.8 HIGH Zephyr virtio driver calls an arbitrary function pointer from an out-of-range used-ring de
CVE-2026-9728 6.4 MEDIUM TOCTOU race in mbox_send syscall verifier allows userspace to leak kernel memory
CVE-2026-13343 5.3 MEDIUM Uninitialised stack memory disclosure in the MIDI 2.0 UMP Stream responder

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-476

V. Comments for CVE-2026-13213

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