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CVE-2026-53372 Linux CVE debrief

The Linux kernel has a resolved vulnerability, CVE-2026-53372, related to iommu/vt-d. The kernel lacks dirty tracking support on nested domains attached to PASID, which could lead to lost dirty pages. To address this, the attachment is blocked early if the nesting parent domain is configured for dirty tracking. This change helps maintain data integrity by ensuring that dirty pages are properly handled. Affected product deployments should be reviewed for exposure, and system administrators should ensure that systems are updated and monitor for any unusual activity related to iommu/vt-d and PASID configurations.

Vendor
Linux
Product
Unknown
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-19
Original CVE updated
2026-07-19
Advisory published
2026-07-19
Advisory updated
2026-07-19

Who should care

System administrators and security teams managing Linux kernel environments, especially those utilizing iommu/vt-d and PASID attachments, should be aware of this vulnerability. Although the issue has been resolved, ensuring that systems are updated and monitoring for any unusual activity related to iommu/vt-d and PASID configurations is crucial.

Technical summary

The CVE-2026-53372 vulnerability in the Linux kernel involves iommu/vt-d and PASID attachments to nested domains. The kernel does not support dirty tracking on such nested domains. If a nesting parent domain is configured for dirty tracking, the attachment is now blocked to prevent potential data loss. This change helps maintain data integrity by ensuring that dirty pages are properly handled. The fix involves updating Linux kernel to the latest version where this vulnerability is resolved. Review and adjust iommu/vt-d and PASID configurations to align with security best practices. Monitor system logs for any unusual activity related to iommu/vt-d and PASID attachments.

Defensive priority

Medium

Recommended defensive actions

  • Update Linux kernel to the latest version where this vulnerability is resolved.
  • Review and adjust iommu/vt-d and PASID configurations to align with security best practices.
  • Monitor system logs for any unusual activity related to iommu/vt-d and PASID attachments.
  • Perform a thorough review of the system to identify potential exposure.
  • Implement compensating controls for exposed systems while remediation is scheduled and verified.
  • Track exceptions and retest remediated assets.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and associated details indicate that this vulnerability has been resolved in the Linux kernel. The issue arises from the lack of dirty tracking support on nested domains attached to PASID, which could result in lost dirty pages. The fix involves blocking the attachment if the parent domain is configured for dirty tracking.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-19T09:17:02.367Z and has not been modified since then.