CVE-2026-31689

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

EDAC/mc: Fix error path ordering in edacmcalloc()

When the mci->pvtinfo allocation in edacmcalloc() fails, the error path will call putdevice() which will end up calling the device's release function.

However, the init ordering is wrong such that device_initialize() happens after the failed allocation and thus the device itself and the release function pointer are not initialized yet when they're called:

MCE: In-kernel MCE decoding enabled. ------------[ cut here ]------------ kobject: '(null)': is not initialized, yet kobjectput() is being called. WARNING: lib/kobject.c:734 at kobjectput, CPU#22: systemd-udevd CPU: 22 UID: 0 PID: 538 Comm: systemd-udevd Not tainted 7.0.0-rc1+ #2 PREEMPT(full) RIP: 0010:kobjectput Call Trace: <TASK> edacmcalloc+0xbe/0xe0 [edaccore] amd64edacinit+0x7a4/0xff0 [amd64_edac] ? __pfxamd64edacinit+0x10/0x10 [amd64edac] dooneinitcall ...

Reorder the calling sequence so that the device is initialized and thus the release function pointer is properly set before it can be used.

This was found by Claude while reviewing another EDAC patch.