CVE-2021-47195

Summary

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

spi: fix use-after-free of the add_lock mutex

Commit 6098475d4cb4 ("spi: Fix deadlock when adding SPI controllers on SPI buses") introduced a per-controller mutex. But mutex_unlock() of said lock is called after the controller is already freed:

spi_unregister_controller(ctlr) -> put_device(&ctlr->dev) -> spi_controller_release(dev) -> mutex_unlock(&ctrl->add_lock)

Move the put_device() after the mutex_unlock().

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxaa3f3d7bef59583f2d3234173105a27ff61ef8fe < 54c2c96eafcfd242e52e932ab54ace4784efe1ddaffected
LinuxLinuxc8dce228db6f81dbc897a018dfc5c418e917cf64 < 11eab327a2a8bd36c38afbff920ae1bd45588dd4affected
LinuxLinux6098475d4cb48d821bdf453c61118c56e26294f0 < 37330f37f6666c7739a44b2b6b95b047ccdbed2daffected
LinuxLinux6098475d4cb48d821bdf453c61118c56e26294f0 < 6c53b45c71b4920b5e62f0ea8079a1da382b9434affected
LinuxLinux722ef19a161ce3fffb3d1b01ce2301c306639bddaffected
LinuxLinux5.14.15 < 5.15affected
LinuxLinux5.15affected
LinuxLinux0 < 5.15unaffected
LinuxLinux5.15.5 <= 5.15.*unaffected
LinuxLinux5.16 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References