CVE-2026-98946
UnknownSummary
In the Linux kernel, the drm/vc4 driver has a race during runtime suspend. vc4_irq_disable() masks V3D interrupt sources and calls synchronize_irq(), but on the ARMCTRL interrupt controller (RPi 0-3) this does not fully quiesce the handler — an interrupt may run after the V3D power domain is off, where register reads return 0xdeadbeef. This can schedule vc4_overflow_mem_work() after it was cancelled. The fix disables the interrupt line across the PM transition and balances IRQ installation/request.
Risk Assessment
On Raspberry Pi 0-3 platforms, interrupts may be mishandled after V3D power-down, causing bogus register reads and potential system instability. The risk mainly affects kernel stability and may lead to unpredictable graphics driver behavior.
Recommendation
Update the Linux kernel to a version containing the drm/vc4 fix (disabling the V3D interrupt line across runtime suspend). If updating is not possible, consider restricting runtime power management for the vc4 driver on affected devices.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Disable the V3D interrupt across runtime suspend vc4_irq_disable() masks the V3D interrupt sources and then calls synchronize_irq() before the V3D is powered down. However, by itself, this is not enough to quiesce the interrupt handler. synchronize_irq() waits for handlers that have already set IRQD_IRQ_INPROGRESS, and for irqchips reporting IRQCHIP_STATE_ACTIVE. A GIC interrupt chip is able to mark an interrupt active as soon as a CPU acknowledges it, so there these checks cover the whole dispatch path. On RPi 0-3, however, the interrupt controller is ARMCTRL, which has no active state. A CPU that has read the hwirq out of the pending register but has not yet reached handle_level_irq() stays invisible to synchronize_irq(). During a power transition, vc4_irq() may therefore run after the power domain is off, where every V3D register read will return 0xdeadbeef. 0xdeadbeef has FLDONE, FRDONE and OUTOMEM set. This problem doesn't trigger NULL pointer dereference issues only because the functions vc4_irq_finish_bin_job() and vc4_irq_finish_render_job() return early when there is no job pointer, but OUTOMEM is still able to schedule vc4_overflow_mem_work() after vc4_irq_disable() has already cancelled it. Therefore, fix the spurious interrupts by disabling the interrupt line across the PM transition. To preserve the enable/disable balance, move vc4_irq_install() and request the IRQ line disabled before the first runtime resume.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS