cve-2022-48867
Vulnerability from cvelistv5
Published
2024-08-21 06:09
Modified
2024-12-19 08:09
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1beeec45f9ac31eba52478379f70a5fa9c2ad005Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b9e8e3fcfec625fc1c2f68f684448aeeb882625bPatch
Impacted products
Vendor Product Version
Linux Linux Version: 63c14ae6c161dec8ff3be49277edc75a769e054a
Version: 63c14ae6c161dec8ff3be49277edc75a769e054a
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   Linux Linux Version: 5.19
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      datePublished: "2024-08-21T06:09:57.153Z",
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