{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64585",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64585"
  ],
  "published": "2026-08-06T07:06:22Z",
  "summary": "can: esd_usb: kill anchored URBs before freeing netdevs",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: esd_usb: kill anchored URBs before freeing netdevs\n\nesd_usb_disconnect() frees each CAN netdev with free_candev() inside\nits per-netdev loop and only calls unlink_all_urbs(dev) afterwards.\nThe per-netdev private data (struct esd_usb_net_priv) is embedded in\nthe net_device allocation returned by alloc_candev(), so once\nfree_candev() has run, dev->nets[i] points to freed memory.\nunlink_all_urbs() then dereferences the freed dev->nets[i] to kill the\nper-netdev TX anchor (usb_kill_anchored_urbs(&priv->tx_submitted)),\nclear active_tx_jobs, and reset priv->tx_contexts[].\n\nReorder the teardown so the anchored URBs are killed before the netdevs\nare freed, matching other CAN/USB drivers in the same directory such as\nems_usb, usb_8dev and mcba_usb, which unregister, then unlink, then\nfree: unregister the netdevs first (which stops their TX queues), call\nunlink_all_urbs(dev) once, then free the netdevs.\n\nThis issue was found by an in-house static analysis tool.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.178",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64585"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d12f6add48f2da15c8c8281961d3faad804c76cf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/aa1d005927db38af783c1a4a8a00a39e0229ab2d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a02e1d8f191324583599544d54e59e6a2b74bb0e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a3314f10369df70925140f59bbe069718f65a0b9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/765ba1c91823a296447528791b89a6504947fd5c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5832c55b3c824ba2fe9c36ac3c411baddcce053e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c43122fef328a70045fe7621c06de6b2b8e19264"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-23T12:46:35Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The UAF is reached by forcing esd_usb_disconnect() via local usbfs USBDEVFS_DISCONNECT, sysfs unbind, or USB emulation, not by network/CAN traffic; this matches AV:L scoring of analogous USB disconnect UAFs (e.g. CVE-2025-40283).\nAC:L - Once disconnect runs, free_candev() then unlink_all_urbs() deterministically uses freed esd_usb_net_priv in the same teardown path; the attacker fully controls when unbind occurs, with no attacker-uncontrollable race required.\nPR:L - A basic local account with write access to the USB device node (plugdev/uaccess or USB passthrough) can issue USBDEVFS_DISCONNECT; that path has no CAP_SYS_ADMIN check, so init-namespace root is not required.\nUI:N - The attacker issues disconnect/unbind against an already-bound esd CAN-USB interface (or their own matching VID/PID device) without any separate victim action.\nS:U - The freed netdev-private object and subsequent URB teardown run entirely within the host kernel security authority; this is not a VM, IOMMU, or sandbox boundary escape.\nC:H - Use-after-free of struct esd_usb_net_priv (embedded in the freed candev) lets a reclaimed object supply attacker-controlled pointer-rich state read through usb_kill_anchored_urbs() and related teardown, enabling kernel disclosure.\nI:H - unlink_all_urbs() writes through the freed priv (usb_kill_anchored_urbs on tx_submitted, atomic_set of active_tx_jobs, and tx_contexts[] resets), giving a heap UAF write primitive suitable for control-flow hijack.\nA:H - Dereferencing the freed per-netdev private data during disconnect reliably causes kernel oops/panic, and the attacker can repeat unbind/rebind to re-trigger the crash."
    }
  }
}