virt:rhel and virt-devel:rhel security and bug fix update

Kernel-based Virtual Machine (KVM) offers a full virtualization solution for Linux on numerous hardware platforms. The virt:rhel module contains packages which provide user-space components used to run virtual machines using KVM. The packages also provide APIs for managing and interacting with the virtualized systems.

Security Fix:

* virt:rhel/libvirt: stack use-after-free in virNetClientIOEventLoop (CVE-2024-4418)

Bug fix:

* virsh destroy with --graceful destroyed a paused guest (qemu process paused by SIGSTOP) (JIRA:RHEL-36064)

CVE-2024-4418
A race condition leading to a stack use-after-free flaw was found in libvirt. Due to a bad assumption in the virNetClientIOEventLoop() method, the `data` pointer to a stack-allocated virNetClientIOEventData structure ended up being used in the virNetClientIOEventFD callback while the data pointer's stack frame was concurrently being "freed" when returning from virNetClientIOEventLoop(). The 'virtproxyd' daemon can be used to trigger requests. If libvirt is configured with fine-grained access control, this issue, in theory, allows a user to escape their otherwise limited access. This flaw allows a local, unprivileged user to access virtproxyd without authenticating. Remote users would need to authenticate before they could access it.

Modularity name: "virt"
Stream name: "rhel"