CVE-2024-26806

In the Linux kernel, the following vulnerability has been resolved: spi: cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks The ->runtime_suspend() and ->runtime_resume() callbacks are not expected to call spi_controller_suspend() and spi_controller_resume(). Remove calls to those in the cadence-qspi driver. Those helpers have two roles currently: - They stop/start the queue, including dealing with the kworker. - They toggle the SPI controller SPI_CONTROLLER_SUSPENDED flag. It requires acquiring ctlr->bus_lock_mutex. Step one is irrelevant because cadence-qspi is not queued. Step two however has two implications: - A deadlock occurs, because ->runtime_resume() is called in a context where the lock is already taken (in the ->exec_op() callback, where the usage count is incremented). - It would disallow all operations once the device is auto-suspended. Here is a brief call tree highlighting the mutex deadlock: spi_mem_exec_op() ... spi_mem_access_start() mutex_lock(&ctlr->bus_lock_mutex) cqspi_exec_mem_op() pm_runtime_resume_and_get() cqspi_resume() spi_controller_resume() mutex_lock(&ctlr->bus_lock_mutex) ... spi_mem_access_end() mutex_unlock(&ctlr->bus_lock_mutex) ...

The following products are affected by CVE-2024-26806 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2024-26806.

URL	Resource
https://git.kernel.org/stable/c/041562ebc4759c9932b59a06527f8753b86da365
https://git.kernel.org/stable/c/959043afe53ae80633e810416cee6076da6e91c6
https://lore.kernel.org/linux-cve-announce/2024040404-CVE-2024-26806-4644@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2024-26806
https://www.cve.org/CVERecord?id=CVE-2024-26806