{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64125",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64125"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "net: bcmgenet: keep RBUF EEE/PM disabled",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bcmgenet: keep RBUF EEE/PM disabled\n\nSetting RBUF_EEE_EN | RBUF_PM_EN in RBUF_ENERGY_CTRL breaks the RX\npath on GENET hardware once MAC EEE becomes active. RX traffic stops\nflowing while the link stays up and the usual descriptor/RX error\ncounters remain quiet. In that state the MAC still accepts frames\n(rbuf_ovflow_cnt keeps climbing) but RBUF no longer forwards them to\nDMA, so rx_packets is no longer incremented at the netdev level. On\nsome boards the corruption ends up as a paging fault in\nskb_release_data via bcmgenet_rx_poll on an LPI exit.\n\nReproduced on Pi 4B (BCM2711 + BCM54213PE) and confirmed by Florian\nFainelli on an internal Broadcom 4908-family board with the same crash\nsignature. RBUF_PM_EN is not publicly documented.\n\nThis shows up more often now that phy_support_eee() enables EEE by\ndefault, but it also affects older kernels as soon as TX LPI is\nturned on via ethtool, so it is not specific to recent changes.\n\nAlways clear RBUF_EEE_EN | RBUF_PM_EN in bcmgenet_eee_enable_set so\nthe bits stay off across resets. UMAC and TBUF setup is left alone so\nTX-side EEE keeps working.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/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-2026-64125"
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  "database_specific": {
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The fault is reached in `bcmgenet_rx_poll` during NAPI processing of received Ethernet frames; any remote host that can send traffic to a GENET-equipped, network-connected target (e.g., internet-exposed Raspberry Pi, Broadcom gateway, or edge IoT device) can drive RX activity and LPI exit transitions that trigger the corrupted RX path.\nAC:L - On affected GENET hardware with an EEE-capable link partner (now common and enabled by default via `phy_support_eee()`), the bug reproduces within minutes under normal RX load without attacker-influenced memory layout, and the attacker controls timing by sending sustained or bursty traffic to force LPI entry/exit cycles.\nPR:N - Exploitation does not require authentication or elevated privileges; EEE is enabled automatically at link-up through `bcmgenet_mii_setup()` \u2192 `bcmgenet_eee_enable_set()`, so a remote attacker only needs the ability to send network packets to the target interface.\nUI:N - No victim action is required beyond the device having a normal link with EEE-capable equipment; the misconfigured RBUF registers and subsequent RX stall or kernel oops occur during routine background network activity.\nS:U - Impact is confined to kernel/network availability on the same host (RX path stall, skb corruption, and kernel panic); there is no demonstrated crossing of a VM, container, or IOMMU security boundary.\nC:H - Hardware RX desynchronization from incorrectly enabled `RBUF_EEE_EN|RBUF_PM_EN` corrupts skb/DMA ring state and manifests as invalid pointers in `skb_release_data` during `bcmgenet_rx_poll`, consistent with use-after-free/double-free class corruption that can enable arbitrary kernel memory disclosure.\nI:H - The same skb pointer corruption in the RX teardown path can yield heap write primitives (double-free/incorrect free of sk_buff metadata) during LPI exit, which is the class of memory corruption typically leveraged for kernel control-flow hijacking.\nA:H - The bug reliably causes complete RX failure (silent loss of connectivity while the link remains up) and can escalate to a fatal kernel oops/panic in softirq context, constituting total loss of network availability and potential full system availability loss."
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}