CVE-2026-64553 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems should be aware of this vulnerability and take steps to apply patches or implement compensating controls.

Technical summary

The CVE-2026-64553 vulnerability involves an information leak in the Linux kernel's psample component. The issue arises from the improper handling of padding in the PSAMPLE_ATTR_DATA attribute. The problem was resolved through a series of commits to the Linux kernel, including 0d3ea2ccddda442077fc44f11d873209c97ec50b, 48930f6c59fd0056c2de46ce52bfe27d9c9e5eb6, and others. These commits address the issue by ensuring proper clearing of the padding to prevent information leaks.

Defensive priority

This vulnerability is related to the Linux kernel and has been resolved. The vulnerability is associated with the psample component, specifically with the PSAMPLE_ATTR_DATA attribute. There is an information leak due to improper padding handling.

Recommended defensive actions

• Review Linux kernel updates and apply patches related to psample and PSAMPLE_ATTR_DATA.
• Monitor Linux kernel security advisories for further information and updates.
• Consider implementing compensating controls to detect and prevent potential exploitation.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE-2026-64553 vulnerability involves an information leak in the Linux kernel's psample component. The issue arises from the improper handling of padding in the PSAMPLE_ATTR_DATA attribute. The problem was resolved through a series of commits to the Linux kernel, including 0d3ea2ccddda442077fc44f11d873209c97ec50b, 48930f6c59fd0056c2de46ce52bfe27d9c9e5eb6, and others. These commits address the issue by ensuring proper clearing of the padding to prevent information leaks.

Official resources