CVE-2026-89604
Description
A flaw was found in the Linux kernel's efivarfs component. An unprivileged local user can exploit this by repeatedly calling the statfs() handler on the efivarfs mount point. This action triggers a flood of calls to the QueryVariableInfo() runtime service, which is particularly costly on x86 systems. The excessive calls can lead to significant performance degradation, potentially resulting in a Denial of Service (DoS).
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)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
When allocating resources without limits, an attacker could prevent other systems, applications, or processes from accessing the same type of resource. It can be easy for an attacker to consume many resources by rapidly making many requests or causing larger resources to be used than is needed.
Frequently Asked Questions
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