CVE-2026-64059
Description
A flaw was found in the Linux kernel's network filesystem (netfs) component. The netfs_perform_write() function, responsible for handling write operations, does not correctly manage private data associated with memory pages, known as folios. This improper handling can lead to memory leaks, where system resources are not properly released. Such leaks could potentially be exploited by an attacker to cause a denial of service by exhausting available memory or to gain unauthorized access to sensitive information.
Statement
Red Hat has evaluated this issue as having a Moderate security impact because successful exploitation requires local user privileges to perform write operations on an active network filesystem mount utilizing the netfs library. The vulnerability stems from improper tracking of memory folio state during buffered write operations, resulting in reference leaks and gradual memory exhaustion. Because the flaw cannot be triggered remotely without local write permissions and does not facilitate privilege escalation or arbitrary code execution, the overall risk is limited.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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