CVE-2024-46762 Information

Description

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.

Reference

https://git.kernel.org/stable/c/e997b357b13a7d95de31681fc54fcc34235fa527 https://git.kernel.org/stable/c/112fd2f02b308564724b8e81006c254d20945c4b https://git.kernel.org/stable/c/611ff1b1ae989a7bcce3e2a8e132ee30e968c557