CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's KVM component, specifically in the memory accounting functions for pinned and unpinned pages. The issue arises from improper reference counting of user structures, which could lead to resource leaks and potential denial of service if unaccounted memory is accessed from different process contexts. Organizations using Linux systems with KVM should prioritize addressing this vulnerability to ensure proper memory management and system stability.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Fix memory accounting for pinned/unpinned pages The account_mem() and unaccount_mem() functions call get_uid() which increments the reference count of struct user_struct on every invocation. But we don't decrement the count by calling free_uid(). It also accounted/unaccounted the pages against the current->mm. But its possible the unaccount_mem() can be called from a different process context than the one that originally pinned the pages. Let's fix this by storing the pinning process user_struct and mm_struct when accounting for pinned pages, and subsequently free these resources when the pages are unpinned. [borntraeger@linux.ibm.com: Fixed whitespace]