CVE-2026-72283

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

KVM: x86: Nullify irqfd->producer if updating IRTE for bypass fails

Nullify irqfd->producer if updating the IRTE for bypass fails, as leaving a
dangling pointer will result in a use-after-free if the irqfd is reachable
through KVM's routing, but the producer is freed separately.  E.g. for VFIO
PCI, the producer is embedded in struct "vfio_pci_irq_ctx" and freed when
the vector is disabled, which can happen independent of routing updates.

[sean: drop PPC change, massage changelog]