CVE-2024-26598

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

KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache

There is a potential UAF scenario in the case of an LPI translation cache hit racing with an operation that invalidates the cache, such as a DISCARD ITS command. The root of the problem is that vgicitscheckcache() does not elevate the refcount on the vgicirq before dropping the lock that serializes refcount changes.

Have vgicitscheckcache() raise the refcount on the returned vgicirq and add the corresponding decrement after queueing the interrupt.