CVE-2026-72489

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

staging: nvec: fix use-after-free in nvec_rx_completed()

In nvec_rx_completed(), when an incomplete RX transfer is detected,

nvec_msg_free() is called to return the message back to the pool by

clearing its 'used' atomic flag. Immediately after this, the code

accesses nvec->rx->data[0] to check the message type.

Since nvec_msg_free() marks the pool slot as available via atomic_set(),

any concurrent or subsequent call to nvec_msg_alloc() could claim that

same slot and overwrite its data[] array. Reading nvec->rx->data[0] after

freeing the message is therefore a use-after-free.

Fix this by saving the message type byte before calling nvec_msg_free(),

then using the saved value for the battery quirk check.