High 8.8Published Jul 19, 2026

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

Updated under an hour ago (Oct 27, 2026, 3:00 AM ET)

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Exploited in the last 30 days

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.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	3468e1e0c639032a603450f0830ccabfa76f5806 builds before 5fe97797412aa8bc0184f78379fafb594bcb7f66; 3468e1e0c639032a603450f0830ccabfa76f5806 builds before 0cd37e746e98ab0baa6d8b812955220775b080d6; from 3468e1e0c639032a603450f0830ccabfa76f5806 before a2650f8461cd8ba287fee2992b36abe733c2bd5e; 3468e1e0c639032a603450f0830ccabfa76f5806 builds before 2fb64f94f9afb774f2fa0c7835727d7a67f89f07; from 3468e1e0c639032a603450f0830ccabfa76f5806 before d71c841be5d9e586ee7f36c0dc8ed4db0d9a1349	CNA record
linux linux_kernel linux:linux_kernel	from 6.4 before 7.0.11; 7.1; 7.1; 7.1; 7.1	NVD

References

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	patch
https://git.kernel.org/stable/c/d71c841be5d9e586ee7f36c0dc8ed4db0d9a1349	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.