CVE-2026-17051
MediumCVSS 6.0Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
The Intel SEDI IPM driver (drivers/ipm/ipm_sedi.c) fails to validate the message length from the doorbell register before copying data into incoming_data_buf. The length field (10 bits) allows up to 1023 bytes while the buffer is only 128 bytes, and the bounds check in HAL is compiled only with CONFIG_DEBUG. This leads to an out-of-bounds write in interrupt context, potentially corrupting kernel structures and causing a crash.
Risk Assessment
A local attacker with access to BAR registers or the host-side ISH driver can trigger an out-of-bounds write in the kernel, leading to kernel data corruption, system crash, or potential privilege escalation. The vulnerability is reachable from the peer processor in intel_ish_5_* configurations.
Recommendation
Update the driver immediately to a version that rejects messages exceeding IPC_DATA_LEN_MAX. If patching is not possible, restrict access to the IPM interface and BAR registers from untrusted software.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS