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CVE-2026-17051— Out-of-bounds write in the Intel SEDI IPM driver from an unvalidated inbound doorbell length

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.

The Intel SEDI IPM (inter-processor mailbox) driver in drivers/ipm/ipm_sedi.c handles an inbound message interrupt in ipm_event_dispose(). It read the peer-written doorbell register, extracted the payload length with IPC_HEADER_GET_LENGTH(), and passed that le

CVSS 6.0 · Medium EPSS 0.11% · P1

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 3.5.0< 4.4.2 affected
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I. Basic Information for CVE-2026-17051

Vulnerability Information

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Vulnerability Title
Out-of-bounds write in the Intel SEDI IPM driver from an unvalidated inbound doorbell length
Source: CVE Program / CVE List V5
Vulnerability Description
The Intel SEDI IPM (inter-processor mailbox) driver in drivers/ipm/ipm_sedi.c handles an inbound message interrupt in ipm_event_dispose(). It read the peer-written doorbell register, extracted the payload length with IPC_HEADER_GET_LENGTH(), and passed that length straight to sedi_ipc_read_msg() to copy the message into struct ipm_sedi_context.incoming_data_buf, without checking it against the buffer size. The doorbell length field is 10 bits wide (IPC_HEADER_LENGTH_MASK is 0x03FF), so it can encode up to 1023 bytes, while incoming_data_buf is IPC_DATA_LEN_MAX (128) bytes. The bounds check in the underlying HAL sedi_ipc_read_msg() is a DBG_CHECK that compiles away unless CONFIG_DEBUG is set, so no check remained in a production image. The doorbell register is written by the peer processor on the other side of the IPC link — for the intel_ish_5_* targets, the host CPU's ISH driver, reached through the device's memory-mapped register window. Host-side software with driver-level or raw BAR access can therefore set a length of up to 1023 and cause the interrupt handler to copy far past the destination buffer. The affected path requires an application to have registered an IPM receive callback via ipm_register_callback(), which is the driver's normal mode of use. The result is an out-of-bounds write of up to 895 bytes into static (.bss) memory, performed in interrupt context. The overflow first clobbers the rest of struct ipm_sedi_context — including the k_sem and k_mutex used by the transmit path, whose wait queues contain self-referential list pointers — and then adjacent static data, giving a kernel data-structure corruption and crash primitive. The overflowing bytes are read from registers following the message window, a portion of which are themselves peer-programmable. The fix rejects any doorbell whose encoded length exceeds IPC_DATA_LEN_MAX, logging it and acknowledging the doorbell so the peer is not left waiting.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
zephyrproject zephyr 3.5.0 ~ 4.4.2 -

II. Public POCs for CVE-2026-17051

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III. Intelligence Information for CVE-2026-17051

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Patches & Fixes for CVE-2026-17051 (1)

Other References for CVE-2026-17051 (1)

Same Patch Batch · zephyrproject · 2026-09-21 · 5 CVEs total

CVE-2026-17052 7.8 HIGH Missing user-pointer validation in tgpio_pin_read_ts_ec syscall handler allows arbitrary s
CVE-2026-17050 5.7 MEDIUM Double free of the USB host configuration descriptor when device enumeration fails
CVE-2026-15890 5.3 MEDIUM AEAD nonce reuse in Zephyr secure_storage ITS default nonce provider due to missing thread
CVE-2026-17054 5.3 MEDIUM Out-of-bounds read and permanent loss of Wi-Fi reception in the ESP-hosted SPI driver's fr

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-787

V. Comments for CVE-2026-17051

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