CVE-2026-64117

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References