Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: airoha: npu: cancel wdt_work after releasing the WDT IRQ airoha_npu_remove() calls cancel_work_sync() on each core's wdt_work, but the watchdog IRQ that queues it is requested with devm_request_irq() and is freed only after .remove() returns. airoha_npu_wdt_handler() can therefore schedule_work() again once the cancel has returned. struct airoha_npu, which contains the work, is devm_kzalloc()'d and is freed in that same unwind, so the late work dereferences freed memory. Register the work with devm_work_autocancel() before devm_request_irq() and drop .remove(). Devres runs in reverse order, so the IRQ is freed before cancel_work_sync(), including when probe fails. A cancel left in .remove() cannot get that order. Initializing the work first also stops a pending watchdog interrupt from queuing an uninitialized work item. Probe currently calls INIT_WORK() only after devm_request_irq(). This issue was identified during our ongoing static-analysis research while reviewing kernel code.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 23290c7bc190def4e1ca61610992d9b7c32e33f3 before aca91d8fa0ecbc990ebf9a688c684dda78a43c00; affected 23290c7bc190def4e1ca61610992d9b7c32e33f3 before da9d42531f3a6dfea2e9c775b62a46185dbf280a; affected 23290c7bc190def4e1ca61610992d9b7c32e33f3 before 4bdee8060d1e4581624e68fbd369b1afb14df4bc |
| Linux / Linux | affected 6.15; unaffected 0 before 6.15; unaffected 6.18.55 through 6.18.*; unaffected 7.2.9 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.