{"id":"CVE-2026-98946","title":"drm/vc4: Disable the V3D interrupt across runtime suspend","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: Disable the V3D interrupt across runtime suspend\n\nvc4_irq_disable() masks the V3D interrupt sources and then calls\nsynchronize_irq() before the V3D is powered …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 9b6f461582e6b07e2ce93227a3e4661846e594ad < e81402c3d42041356cb7978510ebab997bc8d411","Linux >= 9b6f461582e6b07e2ce93227a3e4661846e594ad < 6abc8e4dcfbc1d26a94c0ac037dfb3716f686b1f","Linux 6.1"],"published":"2026-10-23","updated":"2026-10-23","sourceUpdated":"2026-10-23T12:19:05.190Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98946","references":[{"url":"https://git.kernel.org/stable/c/e81402c3d42041356cb7978510ebab997bc8d411"},{"url":"https://git.kernel.org/stable/c/6abc8e4dcfbc1d26a94c0ac037dfb3716f686b1f"}],"tags":["cve.org"],"ingestedAt":"2026-10-23T13:24:55.560Z","slug":"CVE-2026-98946","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: Disable the V3D interrupt across runtime suspend\n\nvc4_irq_disable() masks the V3D interrupt sources and then calls\nsynchronize_irq() before the V3D is powered down. However, by itself,\nthis is not enough to quiesce the interrupt handler.\n\nsynchronize_irq() waits for handlers that have already set\nIRQD_IRQ_INPROGRESS, and for irqchips reporting IRQCHIP_STATE_ACTIVE.\nA GIC interrupt chip is able to mark an interrupt active as soon as a\nCPU acknowledges it, so there these checks cover the whole dispatch path.\nOn RPi 0-3, however, the interrupt controller is ARMCTRL, which has no\nactive state. A CPU that has read the hwirq out of the pending register\nbut has not yet reached handle_level_irq() stays invisible to\nsynchronize_irq().\n\nDuring a power transition, vc4_irq() may therefore run after the power\ndomain is off, where every V3D register read will return 0xdeadbeef.\n0xdeadbeef has FLDONE, FRDONE and OUTOMEM set. This problem doesn't\ntrigger NULL pointer dereference issues only because the functions\nvc4_irq_finish_bin_job() and vc4_irq_finish_render_job() return early\nwhen there is no job pointer, but OUTOMEM is still able to schedule\nvc4_overflow_mem_work() after vc4_irq_disable() has already cancelled it.\n\nTherefore, fix the spurious interrupts by disabling the interrupt line\nacross the PM transition. To preserve the enable/disable balance, move\nvc4_irq_install() and request the IRQ line disabled before the first\nruntime resume.\n\n## Affected\n\n- `Linux >= 9b6f461582e6b07e2ce93227a3e4661846e594ad < e81402c3d42041356cb7978510ebab997bc8d411`\n- `Linux >= 9b6f461582e6b07e2ce93227a3e4661846e594ad < 6abc8e4dcfbc1d26a94c0ac037dfb3716f686b1f`\n- `Linux 6.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}