CVE-2026-64514

A flaw was found in the Linux kernel's userfaultfd mechanism. This vulnerability occurs when the userfaultfd_must_wait() and userfaultfd_huge_must_wait() functions incorrectly read Page Table Entries (PTEs) without proper locking during memory operations. This can lead to an undefined state if a page is being swapped or migrated, potentially causing a process to become unresponsive. The most significant consequence is a denial of service (DoS), where a user's application may freeze indefinitely.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.