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

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.

Timeline

1. Sep 17, 2026, 4:09 PM UTCCVE published
2. Oct 21, 2026, 12:51 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 6bf32599223634294cdc6efb359ffaab1d68073c · fixed in c9c1e3da0a206270e5df470ca1c82de52190d68c; From 6bf32599223634294cdc6efb359ffaab1d68073c · fixed in b451f38cb7f5bca78484362347f039c08c94de95; From 6bf32599223634294cdc6efb359ffaab1d68073c · fixed in 1d753df5899ec356272d08bc4718e82844e4bdf0; From 6bf32599223634294cdc6efb359ffaab1d68073c · fixed in f312ef5026678f14caf1378c5f7fffdf667f9c81; From 6bf32599223634294cdc6efb359ffaab1d68073c · fixed in 966d23c7e68ea32679275a7e3d2383181002c868

• Linux Linux

  6.3

• KernelLinux

  From 6.3.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 5