{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64117",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64117"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "wifi: mac80211: capture fast-RX rate before mesh reuses skb->cb",
  "details": "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64117"
    },
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      "cvss_v3_score": 8.8,
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      "scenario": "AV:A - The bug is reached when mac80211 processes attacker-supplied 802.11 data frames received over WiFi in a mesh deployment; per kernel CNA guidance, WiFi frame delivery is Adjacent rather than fully remote Network.\nAC:L - Once on a mesh network as an authorized peer, an attacker can reliably trigger the no-route unicast forward path by sending frames to destinations without an active mesh path, causing deterministic skb free followed by the UAF read.\nPR:N - Exploitation requires no privileges on the victim host; the attacker only needs to transmit valid mesh data frames from an adjacent peer, not local root, capabilities, or namespace admin rights on the target system.\nUI:N - No victim user action is required beyond normal mesh operation; the bug fires automatically during RX processing of the attacker's frames.\nS:U - Impact is confined to kernel/mac80211 memory on the receiving system and does not cross a VM, container, or IOMMU security boundary.\nC:H - The flaw is a slab use-after-free read of skb->cb via sta_stats_encode_rate(), which can expose freed heap contents and is classified as high confidentiality impact for UAF bugs.\nI:H - Use-after-free of skb control-block memory provides a standard heap corruption primitive that can be developed into arbitrary kernel writes or code execution, not merely a benign stats miscalculation.\nA:H - The freed-skb path produces KASAN-reported slab use-after-free and can cause kernel oops or panic; the condition is repeatable by sending additional triggering frames for denial of service."
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}