CVE-2026-64059 Linux CVE debrief

Who should care

Linux kernel users and maintainers, as well as security teams and vulnerability management teams, should review and apply patches for CVE-2026-64059. Additionally, operators and platform administrators may need to assess the impact on their deployments and take necessary actions.

Technical summary

The Linux kernel vulnerability CVE-2026-64059 is related to the netfs: Fix folio->private handling in netfs_perform_write(). Under some circumstances, netfs_perform_write() doesn't correctly manipulate folio->private, leading to potential multiple attachments of private data with associated folio ref leaks and also leaks of netfs_folio structs or netfs_group refs. This issue can be mitigated by consolidating the place at which a folio is marked uptodate in one place and having that look at what's attached to folio->private and decide how to clean it up and then set the new group.

Defensive priority

Medium

Recommended defensive actions

• Review and apply patches for CVE-2026-64059
• Monitor Linux kernel updates for additional information
• Perform inventory checks for affected systems
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-19T16:17:46.407Z and has not been modified since then. The NVD entry is currently Received. Linux kernel users should verify the impact of this vulnerability on their deployments and review the official advisory for specific guidance.

Official resources