CVE-2026-64117 (GCVE-0-2026-64117)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-08-05 12:39
VLAI
Title
wifi: mac80211: capture fast-RX rate before mesh reuses skb->cb
Summary
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
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3468e1e0c639032a603450f0830ccabfa76f5806 , < 2fb64f94f9afb774f2fa0c7835727d7a67f89f07 (git)
Affected: 3468e1e0c639032a603450f0830ccabfa76f5806 , < d71c841be5d9e586ee7f36c0dc8ed4db0d9a1349 (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/rx.c"
          ],
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              "value": "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\u0027s 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-\u003ecb 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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    "dateReserved": "2026-07-19T07:54:57.035Z",
    "dateUpdated": "2026-08-05T12:39:26.505Z",
    "state": "PUBLISHED"
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      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "wifi: mac80211: capture fast-RX rate before mesh reuses skb-\u003ecb",
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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