CVE-2024-26806

Source
https://nvd.nist.gov/vuln/detail/CVE-2024-26806
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26806.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-26806
Downstream
Published
2024-04-04T08:20:33Z
Modified
2025-10-21T18:47:07.061353Z
Summary
spi: cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks
Details

In the Linux kernel, the following vulnerability has been resolved:

spi: cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks

The ->runtimesuspend() and ->runtimeresume() callbacks are not expected to call spicontrollersuspend() and spicontrollerresume(). 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 SPICONTROLLERSUSPENDED flag. It requires acquiring ctlr->buslockmutex.

Step one is irrelevant because cadence-qspi is not queued. Step two however has two implications: - A deadlock occurs, because ->runtimeresume() is called in a context where the lock is already taken (in the ->execop() 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:

spimemexecop() ... spimemaccessstart() mutexlock(&ctlr->buslock_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)
    ...
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
0578a6dbfe7514db7134501cf93acc21cf13e479
Fixed
041562ebc4759c9932b59a06527f8753b86da365
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
0578a6dbfe7514db7134501cf93acc21cf13e479
Fixed
959043afe53ae80633e810416cee6076da6e91c6

Affected versions

v6.*

v6.6
v6.6-rc2
v6.6-rc3
v6.6-rc4
v6.6-rc5
v6.6-rc6
v6.6-rc7
v6.7
v6.7-rc1
v6.7-rc2
v6.7-rc3
v6.7-rc4
v6.7-rc5
v6.7-rc6
v6.7-rc7
v6.7-rc8
v6.7.1
v6.7.2
v6.7.3
v6.7.4
v6.7.5
v6.7.6
v6.7.7
v6.7.8
v6.8-rc1

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.7.9