CVE-2024-26990 is a vulnerability in the Linux kernel related to KVM (Kernel-based Virtual Machine) and its memory management unit (MMU), specifically concerning write protection of Shadow Page Table Entries (SPTEs) in the Two-Dimensional Paging (TDP) MMU. This issue arises when clearing dirty status flags in certain configurations, potentially leading to inconsistent dirty logs for Level 2 guests. The flaw could allow Level 2 guests to make writes that aren't properly tracked, potentially impacting data integrity and security. Despite the CVSS score of 0, indicating no base exploitability, the SOCRadar Vulnerability Risk Score (SVRS) of 30, along with the "In The Wild" tag suggests a need for monitoring and potential patching. The core problem is in how KVM handles dirty logging for nested virtualization, where an L2 guest runs within an L1 hypervisor. Failing to properly write-protect SPTEs can cause writes from the L2 guest to be missed, leading to discrepancies. While not immediately critical, this vulnerability could be leveraged in more complex attack scenarios, highlighting the importance of staying up-to-date with kernel security patches.