CVE-2026-19738— 蓝牙控制器CIS创建过程中保留RX节点泄漏及可达断言漏洞
一分钟漏洞结论
影响对象
zephyrproject zephyr
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
以下是该漏洞描述信息的中文翻译： 在为创建连接等时流（Connected Isochronous Stream, CIS）而实现的蓝牙链路层控制过程（Link Layer Control Procedure, LLCP）中，会保留一个接收节点（ctx->node_ref.rx，标记为 NODE_RX_TYPE_RETAIN），以便稍后将其作为主机通知重新使用。具体而言，在从设备（peripheral）端等待主机对 LL_CIS_REQ 的回复期间，以及在主设备（central）端发起本地 CIS 创建的整个持续期间
影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| zephyrproject | zephyr | 3.4.0< 4.5.0 |
affected |
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一、 漏洞 CVE-2026-19738 基础信息
漏洞信息
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Vulnerability Title
Retained RX node leak and reachable assertion in Bluetooth Controller CIS Create procedures
来源: CVE Program / CVE List V5
Vulnerability Description
The Bluetooth Link Layer Control Procedure (LLCP) implementation for Connected Isochronous Stream (CIS) creation retains an RX node (ctx->node_ref.rx, marked NODE_RX_TYPE_RETAIN) so it can later be reused as the host notification — on the peripheral while awaiting the Host's reply to an LL_CIS_REQ, and on the central for the whole duration of a locally initiated CIS Create. In subsys/bluetooth/controller/ll_sw/ull_llcp_cc.c, the "invalid PDU received" paths of llcp_rp_cc_rx() and llcp_lp_cc_rx() terminated the connection and completed the procedure without releasing that retained node, breaking the invariant checked in llcp_lr_check_done() and llcp_rr_check_done() and orphaning the node's memory.
A peer device within radio range can reach this with a single extra LL Control PDU on an unauthenticated, unencrypted ACL link. Against a peripheral, the attacker sends a valid LL_CIS_REQ and then, before the Host replies, any unrelated LL Control PDU (for example LL_VERSION_IND), which ull_cp_rx() routes into the active remote procedure. Against a central performing a CIS Create, a malicious peripheral answers with LL_UNKNOWN_RSP for CIS_REQ, which is dispatched into the active local procedure. No pairing, encryption or user interaction is required; the code is compiled in when CONFIG_BT_CTLR_PERIPHERAL_ISO or CONFIG_BT_CTLR_CENTRAL_ISO is enabled.
In default builds (CONFIG_BT_CTLR_ASSERT_DEBUG is default y) the retained-node assertion fires immediately, producing a controller fatal error and, typically, a system reset from one injected PDU. With the development assertions disabled, each attempt permanently loses one node from the controller's small LL notification pool (LL_PDU_RX_CNT, 2 * CONFIG_BT_CTLR_LLCP_CONN) together with its memq_link_t; repeating the connect-attack-reconnect cycle exhausts the pool, after which notification allocation always fails, RX flow control stalls, and the non-disableable LL_ASSERT_ERR() in llcp_lp_cc_flush() faults. The impact is limited to availability — the leaked node is orphaned, never reused or double-freed — and recovery requires a reboot.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| zephyrproject | zephyr | 3.4.0 ~ 4.5.0 | - |
|
二、漏洞 CVE-2026-19738 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-19738 补丁与修复 (1)
CVE-2026-19738 厂商安全公告 (1)
同批安全公告 · zephyrproject · 2026-10-11 · 共 11 条
| CVE-2026-19736 | 7.8 HIGH | NXP MCUX TRNG熵驱动越界写入漏洞 |
| CVE-2026-19669 | 7.8 HIGH | 燃料计量系统调用验证器无界变长数组导致内核栈溢出 |
| CVE-2026-19935 | 7.5 HIGH | Zephyr蓝牙协议栈L2CAP通道使用后释放漏洞 |
| CVE-2026-19577 | 7.1 HIGH | IPv6路由转发中越界读取漏洞 |
| CVE-2026-19576 | 6.8 MEDIUM | Goodix GT911 触摸屏控制器驱动栈外写入漏洞 |
| CVE-2026-19740 | 6.5 MEDIUM | 蓝牙LE控制器：PHY更新过程中的RX节点泄露和可达断言漏洞 |
| CVE-2026-19739 | 6.5 MEDIUM | 蓝牙LE控制器连接更新时意外LL控制PDU导致内存泄漏 |
| CVE-2026-19737 | 5.5 MEDIUM | ESP32 I2S驱动空指针解引用漏洞 |
| CVE-2026-19735 | 4.8 MEDIUM | Zephyr TCP栈可预测TCP初始序列号漏洞 |
| CVE-2026-18418 | 3.4 LOW | zbus 代理代理越界读取漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-19738
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