CVE-2024-46762

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

xen: privcmd: Fix possible access to a freed kirqfd instance

Nothing prevents simultaneous ioctl calls to privcmd_irqfd_assign() and

privcmd_irqfd_deassign(). If that happens, it is possible that a kirqfd

created and added to the irqfds_list by privcmd_irqfd_assign() may get

removed by another thread executing privcmd_irqfd_deassign(), while the

former is still using it after dropping the locks.

This can lead to a situation where an already freed kirqfd instance may

be accessed and cause kernel oops.

Use SRCU locking to prevent the same, as is done for the KVM

implementation for irqfds.