Linux Kernel s390/pci Duplicate pci_dev_put Vulnerability in disable_slot Function

A vulnerability in the Linux kernel's s390/pci subsystem was introduced by a recent commit that altered how the power-off state of a physical function (PF) with child virtual functions (VFs) is handled. The modification inadvertently created a double reference release by leaving an existing pci_dev_put call intact, which could lead to a use-after-free condition if the pci_dev structure is freed while in an unexpected state. This issue has been addressed by removing the redundant pci_dev_put call.

Impact

The vulnerability could cause a use-after-free condition, potentially leading to memory corruption or exploitation opportunities.