CVE-2026-64602

Summary

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

iio: adc: spear: Initialize completion before requesting IRQ

In the report from Jaeyoung Chung:

"spear_adc_probe() in drivers/iio/adc/spear_adc.c registers its interrupt handler with devm_request_irq() before it initializes st->completion with init_completion(). If an interrupt arrives after devm_request_irq() and before init_completion(), the handler calls complete() on an uninitialized completion, causing a kernel panic.

The probe path, in spear_adc_probe():

iodev = devm_iio_device_alloc(&pdev->dev, sizeof(*st)); /* st kzalloc-zeroed */
...
retval = devm_request_irq(&pdev->dev, irq, spear_adc_isr, 0,
                          LPC32XXAD_NAME, st);           /* register handler */
...
init_completion(&st->completion);                       /* initialize completion */

spear_adc_isr() calls complete():

complete(&st->completion);

If the device raises an interrupt before init_completion() runs, complete() acquires the uninitialized wait.lock and walks the zeroed task_list in swake_up_locked(). The zeroed task_list makes list_empty() return false, so swake_up_locked() dereferences a NULL list entry, triggering a KASAN wild-memory-access."

Fix the chance of a spurious IRQ causing an uninitialized pointer dereference by moving init_completion() above devm_request_irq().

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/aea8ae6c4d3ed58d9223360f758df6bd8b90c608
• https://git.kernel.org/stable/c/67a49ab41320b3f721ce4be7447754ff040acbd5
• https://git.kernel.org/stable/c/a50757398794aaa25f908b96c6733e045466cba4
• https://git.kernel.org/stable/c/f3f90bc7b38ba3ff14f131cea0f8eb77624787a8
• https://git.kernel.org/stable/c/37077d8271b1f24894fbc21bca1c4cd337525d31
• https://git.kernel.org/stable/c/bbfebae473ac2c8a194523b29ccb9b45f02f134c
• https://git.kernel.org/stable/c/eb5b07c9d0ec1a9d4b6871b14793c19967d79dc4
• https://git.kernel.org/stable/c/3ee2128b6f0eb0be7b6cb8f6e0f1f113a65201a0

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