CVE-2026-89740

In the Linux kernel, the following vulnerability has been resolved:

serial: imx: serialize imx uart ports[] lifetime

imx uart probe() publishes its devm-allocated port in imx uart ports[] before uart add one port() because console setup uses the table. The entry is not cleared when adding the port fails or after removal, leaving a dangling pointer.

A sibling probe can register the shared console through that stale entry. This was reproduced under KASAN on QEMU mcimx6ul-evk by unbinding a sibling UART, unbinding the console UART and rebinding the sibling.

Keep the entry valid through uart remove one port(), then clear it. Protect port addition and removal together with their table updates so sibling operations cannot interleave. Reject an occupied slot rather than clobbering an active port during a duplicate-line probe.