CVE-2026-10683 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-10683MEDIUM

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

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   P   L   N   N  U  N  N  H    4.6   .0016    6.1     —

AFFECTED
  Product  Versions  Fixed
  zephyr   4.0.0 –   —

TIMELINE
  Jun 2   Reserved by zephyr
  Jul 27  EXPLOIT PUBLISHED — CVE-2026-10683 (zephyrproject zephyr). Public exploit reference added.
  Jul 27  Published (CNA: zephyr)

CWE-835 · CNA: zephyr · CVSS v3.1 · 2 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 2, 2026	Reserved	Reserved by zephyr
July 27, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-10683 (zephyrproject zephyr). Public exploit reference added.
July 27, 2026	Published	Published (CNA: zephyr)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
zephyrproject	zephyr	—	4.0.0	—

Weaknesses

CWE-835

References (2)

https://github.com/zephyrproject-rtos/zephyr/commit/06e2053efe0e324d71cc29cdd95160fff643730a [Patch]
https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fj9c-r5qw-3639 [Exploit, Patch, Vendor Advisory]

Authoritative record: CVE-2026-10683 at cve.org

Vendors: zephyrproject

Weaknesses: CWE-835

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-10683 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.