CVE-2026-64117
Full vulnerability record from the local CVENow database.
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.
Severity
HIGH
CVSS score
8.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-07-19 16:17:53.217000
Last modified
2026-10-21 13:19:20.880000
View original CVE JSON
{
"id": "CVE-2026-64117",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-07-19T16:17:53.217",
"lastModified": "2026-10-21T13:19:20.880",
"vulnStatus": "Modified",
"cveTags": [],
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{
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: capture fast-RX rate before mesh reuses skb->cb\n\nieee80211_invoke_fast_rx() reads RX status through\nIEEE80211_SKB_RXCB(skb), which aliases the same skb->cb storage\nthat ieee80211_rx_mesh_data() reuses as IEEE80211_TX_INFO. In the\nunicast forward path, mesh_data does:\n\n\tinfo = IEEE80211_SKB_CB(fwd_skb);\n\tmemset(info, 0, sizeof(*info));\n\non the same skb the caller still names via rx->skb, then either\nqueues the skb for TX (success) or kfree_skb()'s it (no-route)\nbefore returning RX_QUEUED. The caller's RX_QUEUED arm then\ncalls sta_stats_encode_rate(status) on memory that is either\nzeroed (success path) or freed (no-route path). The latter is\nKASAN slab-use-after-free in ieee80211_prepare_and_rx_handle.\n\nFix by encoding the rate from status before invoking\nieee80211_rx_mesh_data(), so the RX_QUEUED arm consumes a value\ncaptured while status was still backed by valid memory."
}
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"baseScore": 8.8,
"baseSeverity": "HIGH",
"attackVector": "ADJACENT_NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
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