{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53088",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53088"
  ],
  "published": "2026-06-24T16:31:02Z",
  "summary": "net: bcmgenet: fix off-by-one in bcmgenet_put_txcb",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bcmgenet: fix off-by-one in bcmgenet_put_txcb\n\nThe write_ptr points to the next open tx_cb. We want to return the\ntx_cb that gets rewinded, so we must rewind the pointer first then\nreturn the tx_cb that it points to. That way the txcb can be correctly\ncleaned up.",
  "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-2026-53088"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/14e9f86564fff7bcf7f45c1b69080e837b31d185"
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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 vulnerable path is the bcmgenet Ethernet transmit path, reachable when a network-facing embedded/router system sends replies or forwards attacker-supplied traffic through the affected interface.\nAC:L - The off-by-one cleanup is deterministic once the transmit error/reclaim path is reached, and an attacker can repeatedly drive transmit activity and resource pressure without needing to win an uncontrolled race.\nPR:N - No authentication or local account is required in the highest-impact network-facing deployment, because unauthenticated network traffic can cause packets to be transmitted through the driver.\nUI:N - Exploitation does not require a victim user to open a file, mount media, or perform any other interactive action.\nS:U - The impact remains within the kernel and the affected host's networking/DMA resources, without crossing a separate security authority such as a VM boundary.\nC:H - The wrong transmit control block can leave stale skb/DMA metadata and later operate on dangling kernel objects, making kernel memory disclosure a defensible worst-case outcome.\nI:H - The stale control-block cleanup can plausibly become double-free or use-after-free style kernel heap corruption, which is treated as high integrity impact.\nA:H - Even without full exploitation, incorrect cleanup of transmit control blocks and DMA mappings can corrupt driver state, leak resources, or crash/hang networking/kernel execution."
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}