Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Prevent use after free on completion memory On driver unload any pending descriptors are flushed at the time the interrupt is freed: idxd_dmaengine_drv_remove() -> drv_disable_wq() -> idxd_wq_free_irq() -> idxd_flush_pending_descs(). If there are any descriptors present that need to be flushed this flow triggers a "not present" page fault as below: BUG: unable to handle page fault for address: ff391c97c70c9040 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page The address that triggers the fault is the address of the descriptor that was freed moments earlier via: drv_disable_wq()->idxd_wq_free_resources() Fix the use after free by freeing the descriptors after any possible usage. This is done after idxd_wq_reset() to ensure that the memory remains accessible during possible completion writes by the device.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 63c14ae6c161dec8ff3be49277edc75a769e054a before b9e8e3fcfec625fc1c2f68f684448aeeb882625b; affected 63c14ae6c161dec8ff3be49277edc75a769e054a before 1beeec45f9ac31eba52478379f70a5fa9c2ad005 |
| Linux / Linux | affected 5.19; unaffected 0 before 5.19; unaffected 6.1.8 through 6.1.*; unaffected 6.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/b9e8e3fcfec625fc1c2f68f684448aeeb882625b
- https://git.kernel.org/stable/c/1beeec45f9ac31eba52478379f70a5fa9c2ad005
ADP enrichment
No English description supplied.
No references supplied.