# CVE-2024-26806: linux: In the Linux kernel, the following vulnerability has been resolved:  spi: cadence-qspi: remove system-wide suspend he...

CVE-2024-26806 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-26806, released April 4, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-26806
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 4, 2024

## Description

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)         ...

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.7.9-1 | [DEBIAN-CVE-2024-26806](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26806.md) | Apr 4, 2024 |
| Linux | linux Debian 14 | 6.7.9-1 | [DEBIAN-CVE-2024-26806](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26806.md) | Apr 4, 2024 |

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