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CVE-2026-90397

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

Description (CNA)

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 (CNA)

Vendor / productVersions
Linux / Linuxaffected 6bf32599223634294cdc6efb359ffaab1d68073c before c9c1e3da0a206270e5df470ca1c82de52190d68c; affected 6bf32599223634294cdc6efb359ffaab1d68073c before b451f38cb7f5bca78484362347f039c08c94de95; affected 6bf32599223634294cdc6efb359ffaab1d68073c before 1d753df5899ec356272d08bc4718e82844e4bdf0; affected 6bf32599223634294cdc6efb359ffaab1d68073c before f312ef5026678f14caf1378c5f7fffdf667f9c81; affected 6bf32599223634294cdc6efb359ffaab1d68073c before 966d23c7e68ea32679275a7e3d2383181002c868
Linux / Linuxaffected 6.3; unaffected 0 before 6.3; unaffected 6.6.160 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References