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

The Intel SEDI IPM inter-processor mailbox driver in drivers/ipm/ipmsedi.c handles an inbound message interrupt in ipmeventdispose. It read the peer-written doorbell register, extracted the payload length with IPCHEADERGETLENGTH, and passed that length straight to sediipcreadmsg to copy the messa...