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CVE-2026-10683— DesignWare I2C target driver can be wedged into a permanent stuck state by an on-bus master (DoS)

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.

zephyrproject Zephyr是zephyrproject组织开源的一款面向物联网设备的实时操作系统。 zephyrproject Zephyr 4.0.0版本至4.5.0之前版本存在资源管理错误漏洞，该漏洞源于Synopsys DesignWare I2C驱动在目标/从机模式下状态管理不当，START_DET中断未启用，导致STOP中断丢失或重复START-WRITE序列时驱动永久处于CMD_SEND状态，不再调用write_requested()回调，可能造成I2C目标功能异常和拒绝服务。

CVSS 2.4 · Low EPSS 0.24% · P14

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 4.0.0< 4.4.2 affected
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I. Basic Information for CVE-2026-10683

Vulnerability Information
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Vulnerability Title
DesignWare I2C target driver can be wedged into a permanent stuck state by an on-bus master (DoS)
Source: CVE Program / CVE List V5
Vulnerability Description
In the Synopsys DesignWare I2C driver (drivers/i2c/i2c_dw.c) operating in target/slave mode, the rx_full interrupt handler gates the write_requested() callback on dw->state != CMD_SEND, and dw->state is only reset to READY on a STOP interrupt. The START_DET interrupt, whose handler in i2c_dw_slave_read_clear_intr_bits() would reset the state on every (re)START, was never added to the enabled interrupt mask in i2c_dw_slave_register(), so that recovery path was dead code. As a result, if the STOP interrupt is lost (bus glitch/reset, or a concurrent master driving STOP) or the bus master issues a legal WRITE-repeated-START-WRITE sequence with the same direction, the driver remains in CMD_SEND permanently and never invokes write_requested() again for the life of the target. An I2C master on the same physical bus can deliberately trigger this, causing the I2C target function to malfunction for all subsequent write transactions and desynchronizing consumer framing state (e.g. MCTP-over-I2C), a recoverable-by-reset denial of service of the target peripheral. The fix unmasks START_DET so the state is reset at every bus (re)START. Impact is availability-only over a local board-level bus; no memory corruption results in the in-tree consumer, whose per-byte buffer write is independently bounds-checked.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
zephyrproject Zephyr 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zephyrproject Zephyr是zephyrproject组织开源的一款面向物联网设备的实时操作系统。 zephyrproject Zephyr 4.0.0版本至4.5.0之前版本存在资源管理错误漏洞，该漏洞源于Synopsys DesignWare I2C驱动在目标/从机模式下状态管理不当，START_DET中断未启用，导致STOP中断丢失或重复START-WRITE序列时驱动永久处于CMD_SEND状态，不再调用write_requested()回调，可能造成I2C目标功能异常和拒绝服务。
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
zephyrproject zephyr 4.0.0 ~ 4.4.2 -

II. Public POCs for CVE-2026-10683

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III. Intelligence Information for CVE-2026-10683

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Patches & Fixes for CVE-2026-10683 (1)

Vendor Advisories for CVE-2026-10683 (1)

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-835

V. Comments for CVE-2026-10683

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