Use After Free Affecting kernel-tools package, versions <0:4.18.0-477.64.1.el8_8

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

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 vgic_its_check_cache() does not elevate the refcount on the vgic_irq before dropping the lock that serializes refcount changes.

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

• https://access.redhat.com/security/cve/CVE-2024-26598
• https://git.kernel.org/stable/c/12c2759ab1343c124ed46ba48f27bd1ef5d2dff4
• https://git.kernel.org/stable/c/65b201bf3e9af1b0254243a5881390eda56f72d1
• https://git.kernel.org/stable/c/ad362fe07fecf0aba839ff2cc59a3617bd42c33f
• https://git.kernel.org/stable/c/ba7be666740847d967822bed15500656b26bc703
• https://git.kernel.org/stable/c/d04acadb6490aa3314f9c9e087691e55de153b88
• https://git.kernel.org/stable/c/dba788e25f05209adf2b0175eb1691dc89fb1ba6
• https://git.kernel.org/stable/c/dd3956a1b3dd11f46488c928cb890d6937d1ca80
• https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html