CVE-2026-90397

Summary

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

firmware: qcom: scm: Fix NULL dereference in IRQ handler before __scm is published

In qcom_scm_probe(), devm_request_threaded_irq() is called before smp_store_release(&__scm, scm). Two paths can dereference __scm before it is published, both causing a NULL pointer dereference.

The IRQ handler receives scm via its data argument but passes only wq_ctx to qcom_scm_waitq_wakeup() and qcom_scm_get_completion(), which then dereference __scm directly. Thread scm through both functions so the IRQ handler path never touches __scm.

Non-atomic SMC calls made during probe (e.g. from qcom_tzmem_init via qcom_scm_shm_bridge_enable) can return WAITQ_SLEEP, causing qcom_scm_wait_for_wq_completion() to run before __scm is published and dereference it. Add platform_set_drvdata(pdev, scm) early in probe and change qcom_scm_wait_for_wq_completion() to take the device pointer and use dev_get_drvdata() to reach scm, removing any dependency on __scm.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/b451f38cb7f5bca78484362347f039c08c94de95
• https://git.kernel.org/stable/c/1d753df5899ec356272d08bc4718e82844e4bdf0
• https://git.kernel.org/stable/c/f312ef5026678f14caf1378c5f7fffdf667f9c81
• https://git.kernel.org/stable/c/966d23c7e68ea32679275a7e3d2383181002c868

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