CVE-2022-48867

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.

The following products are affected by CVE-2022-48867 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2022-48867.

URL	Resource
https://git.kernel.org/stable/c/1beeec45f9ac31eba52478379f70a5fa9c2ad005
https://git.kernel.org/stable/c/b9e8e3fcfec625fc1c2f68f684448aeeb882625b
https://lore.kernel.org/linux-cve-announce/2024082103-CVE-2022-48867-a428@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2022-48867
https://www.cve.org/CVERecord?id=CVE-2022-48867