CVE-2026-98344

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

dmaengine: Fix device kref underflow in dma_chan_put()

dma_chan_get() takes chan->device->ref only on the slow path:

/* no kref on fast path */

if (chan->client_count) {

__module_get(owner);

chan->client_count++;

return 0;

}

if (!try_module_get(owner))

return -ENODEV;

if (!dma_device_get(chan->device)) { // calls kref_get_unless_zero()

dma_chan_put() drops the ref unconditionally, so every fast-path

get/put pair drops one extra device reference.

The bug fires when two conditions hold together: a non-private

provider has a persistent client holding chan->client_count > 0

and another client cycles dmaengine_get()/dmaengine_put().

When the kref hits zero, the subsequent dma_find_channel() returns

NULL even though the provider module is still loaded.

Fix this by dropping device->ref only on the last put, matching the

single slow-path get.