CVE-2026-90397
UnknownSummary
In the Linux kernel, qcom_scm_probe() calls devm_request_threaded_irq() before smp_store_release(&__scm, scm). Two paths can dereference __scm before it is published, both causing a NULL pointer dereference.
Risk Assessment
A NULL pointer dereference in the kernel can lead to a system crash (panic) and denial of service.
Recommendation
Update the Linux kernel to a version containing the fix that threads scm through the IRQ handler functions and sets platform_set_drvdata() early in probe.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS