CVE-2026-80953

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

i3c: master: adi: initialize the lock before enabling interrupts

adi i3c master probe() requests the IRQ and unmasks REG IRQ PENDING CMDR before the controller's IBI state, transfer queue list and transfer queue lock are initialized. A pending CMDR interrupt can therefore run adi i3c master irq() and take master->xferqueue.lock before the dynamic lock has been initialized.

This issue was found by our static analysis tool and then manually reviewed against the current tree.

The grounded PoC kept the probe ordering and the IRQ path adi i3c master probe() -> adi i3c master irq() -> xferqueue.lock, with a pending CMDR interrupt arriving after REG IRQ PENDING CMDR is unmasked. Lockdep reported:

INFO: trying to register non-static key. you didn't initialize this object before use? lock acquire+0xbb/0x290 raw spin lock irqsave+0x36/0x60 adi i3c master irq+0x32/0x56 [vuln msv] adi i3c master probe+0x5a/0xf47 [vuln msv]

Initialize the transfer queue and IBI state before requesting and unmasking the IRQ.