CVE-2024-26598

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: arm64: vgic-its: Evite posibles UAF en la caché de traducción LPI. Existe un escenario potencial de UAF en el caso de que un caché de traducción LPI se acelere con una operación que invalide la caché, como un comando DISCARD ITS. La raíz del problema es que vgic_its_check_cache() no eleva el refcount en vgic_irq antes de eliminar el bloqueo que serializa los cambios de refcount. Haga que vgic_its_check_cache() aumente el refcount en el vgic_irq devuelto y agregue el decremento correspondiente después de poner en cola la interrupción.

A flaw was found in the Linux kernel pertaining to a potential use-after-free (UAF) scenario in a system involving Logical Partitioning Interrupts (LPI) translation cache operations. Specifically, the issue arises when a cache hit occurs concurrently with an operation that invalidates the cache, such as a DISCARD ITS command. The root cause is traced to vgic_its_check_cache() not appropriately managing the reference count of the vgic_irq object. Upon returning from this function, the reference count of vgic_irq is not incremented. This issue can lead to the object being prematurely freed while still in use by other parts of the system, potentially resulting in undefined behavior or system instability.