{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72109",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72109"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "net: sparx5: unregister blocking notifier on init failure",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sparx5: unregister blocking notifier on init failure\n\nsparx5_register_notifier_blocks() registers the switchdev blocking\nnotifier before allocating the ordered workqueue. If the workqueue\nallocation fails, the error path unregisters the switchdev and netdevice\nnotifiers, but leaves the blocking notifier registered.\n\nAdd a separate error label for the workqueue allocation failure path and\nunregister the switchdev blocking notifier there.",
  "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-2026-72109"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fbc65b17508ed5464b7106e7fa5f15251ca1b603"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e5afc6d3fabdf1f605d63c4b34a3df6c359e81f3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cf419c869e0d03aad4b6f4ecf0a813851930dfe7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d6084c47389fd6978a5d66b0d58206a548c792a9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8a3c44a003176282ee4306b7c96e5a536c6f0707"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/17f113e7b622dc850992ade540181717de6a8561"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/483be61b4a9a6df3b7cb277e8f189e082dee4cb8"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation reaches sparx5_switchdev_blocking_event through global switchdev blocking notifier callbacks fired by local bridge/VLAN/MDB configuration via rtnetlink, not by processing remote packets on Sparx5 switch ports.\nAC:L - After a sparx5 probe workqueue ENOMEM leaves the blocking notifier registered and devm frees sparx5, an attacker can reliably trigger call_switchdev_blocking_notifiers with ordinary bridge or VLAN netlink operations without uncontrollable races.\nPR:L - Triggering switchdev blocking events requires CAP_NET_ADMIN for bridge/VLAN changes; unprivileged users can obtain that capability in user/network namespaces and invoke the global notifier chain from their own bridge configuration.\nUI:N - No victim interaction is required beyond the attacker performing network administration operations; no user must open files, mount filesystems, or click anything to reach the stale notifier callback.\nS:U - The use-after-free corrupts kernel memory within the same kernel security authority on Sparx5/LAN969x switch platforms, enabling local privilege escalation but not VM escape or other cross-authority boundary bypass by itself.\nC:H - The leaked switchdev_blocking_nb remains on a global chain after devm frees the containing sparx5 structure; sparx5_switchdev_blocking_event dereferences it via container_of, creating a use-after-free that can disclose kernel memory.\nI:H - UAF callbacks such as sparx5_handle_port_vlan_add and MDB handlers dereference freed sparx5 state and can write through sparx5_mact_learn and related hardware programming, enabling memory corruption and potential arbitrary code execution.\nA:H - Dereferencing freed notifier_block and sparx5 structures during global switchdev blocking events can cause kernel oops, panic, or hang, disrupting availability on enterprise, industrial, and automotive Sparx5-managed switch systems."
    }
  }
}