CVE-2026-90433

Summary

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

spi: oc-tiny: switch to managed controller allocation

The controller is allocated with the non-managed spi_alloc_host() while the interrupt is registered with devm_request_irq(). During removal, spi_bitbang_stop() only unregisters the controller; the subsequent spi_controller_put() then frees the controller together with its embedded driver-private devdata, which is the IRQ handler's dev_id. The devm_request_irq() release action (free_irq()), which drains the handler, does not run until after .remove() returns. A late or latched interrupt can therefore reach tiny_spi_irq() and dereference already-freed memory (e.g. hw->base).

Switch to devm_spi_alloc_host() so that the devres LIFO order releases the controller only after free_irq() has drained the handler, and drop the now-redundant spi_controller_put() from .remove(). The probe error path is simplified to direct returns.

This issue was found by an in-house static analysis tool.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/0260c94453a08491640e61f8cf0c384edbe7bd11
• https://git.kernel.org/stable/c/ef5cc4a8c088d05549f71950a72b5deff5000fd7
• https://git.kernel.org/stable/c/1cd16c8d68f58e54abb8f331d05469237200631f
• https://git.kernel.org/stable/c/d710f43ce30975d197f73c543bfe47b958d8ba17

• ←Previous
• Next→