CVE-2026-74520
Description
A flaw was found in the Linux kernel's IOMMU (Input/Output Memory Management Unit) and IOMMUFD (IOMMU File Descriptor) components. This vulnerability is a Use-After-Free (UAF), which means the system attempts to use memory that has already been released. Specifically, during device detachment or hardware page table replacement, an IOMMU Page Fault (IOPF) group can be freed while still being referenced by other parts of the system. An attacker could potentially exploit this to cause system instability, crashes, or achieve privilege escalation.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
If the expired pointer is used in a read operation, an attacker might be able to control data read in by the application.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If the expired pointer references a memory location that is not accessible to the product, or points to a location that is "malformed" (such as NULL) or larger than expected by a read or write operation, then a crash may occur.
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If the expired pointer is used in a function call, or points to unexpected data in a write operation, then code execution may be possible.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
