Use After Free Affecting kernel-rt-modules-extra package, versions *

Note: Versions mentioned in the description apply only to the upstream kernel-rt-modules-extra package and not the kernel-rt-modules-extra package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

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

vdpa: fix use-after-free on vp_vdpa_remove

When vp_vdpa driver is unbind, vp_vdpa is freed in vdpa_unregister_device and then vp_vdpa->mdev.pci_dev is dereferenced in vp_modern_remove, triggering use-after-free.

Call Trace of unbinding driver free vp_vdpa : do_syscall_64 vfs_write kernfs_fop_write_iter device_release_driver_internal pci_device_remove vp_vdpa_remove vdpa_unregister_device kobject_release device_release kfree

Call Trace of dereference vp_vdpa->mdev.pci_dev: vp_modern_remove pci_release_selected_regions pci_release_region pci_resource_len pci_resource_end (dev)->resource[(bar)].end

• https://access.redhat.com/security/cve/CVE-2022-48861
• https://git.kernel.org/stable/c/4b1743bc715a3691a63ac21b349079b07bf1b19e
• https://git.kernel.org/stable/c/dc54ba9932aeaaa1a21fe214af1f446593a78274
• https://git.kernel.org/stable/c/eb057b44dbe35ae14527830236a92f51de8f9184