GHSA-7G3Q-GX5W-5QP5

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-19 18:32
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

can: bcm: fix stale rx/tx ops after device removal

RX: an RX_SETUP update(!) for an existing op skipped can_rx_register() unconditionally, even when a concurrent NETDEV_UNREGISTER had already torn down its registration (op->rx_reg_dev == NULL). This silently did not re-enable frame delivery for that updated filter. bcm_rx_setup() now re-registers in that case, while leaving rx_ops with ifindex = 0 (all CAN devices) which never carry a tracked rx_reg_dev registered as-is.

TX: bcm_notify() only handled bo->rx_ops on NETDEV_UNREGISTER, leaving tx_ops with an active cyclic transmission re-arming its hrtimer indefinitely to execute bcm_tx_timeout_handler(). Cancelling the hrtimer prevents the runaway timer and any injection into a later reused ifindex, since nothing else calls bcm_can_tx() for the op until an explicit TX_SETUP update re-arms it.

Unlike bcm_rx_unreg(), which clears the tracked rx_reg_dev for rx_ops, the ifindex is intentionally left unchanged for tx_ops. bcm_tx_setup() always rejects ifindex 0, so clearing it would strand the op: neither a later TX_SETUP (bcm_find_op()) nor TX_DELETE (bcm_delete_tx_op()) could ever find it again, since both require an exact ifindex match.

Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-72116"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:26Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: fix stale rx/tx ops after device removal\n\nRX: an RX_SETUP update(!) for an existing op skipped can_rx_register()\nunconditionally, even when a concurrent NETDEV_UNREGISTER had already\ntorn down its registration (op-\u003erx_reg_dev == NULL). This silently\ndid not re-enable frame delivery for that updated filter. bcm_rx_setup()\nnow re-registers in that case, while leaving rx_ops with ifindex = 0\n(all CAN devices) which never carry a tracked rx_reg_dev registered as-is.\n\nTX: bcm_notify() only handled bo-\u003erx_ops on NETDEV_UNREGISTER, leaving\ntx_ops with an active cyclic transmission re-arming its hrtimer\nindefinitely to execute bcm_tx_timeout_handler(). Cancelling the hrtimer\nprevents the runaway timer and any injection into a later reused ifindex,\nsince nothing else calls bcm_can_tx() for the op until an explicit\nTX_SETUP update re-arms it.\n\nUnlike bcm_rx_unreg(), which clears the tracked rx_reg_dev for rx_ops,\nthe ifindex is intentionally left unchanged for tx_ops. bcm_tx_setup()\nalways rejects ifindex 0, so clearing it would strand the op: neither a\nlater TX_SETUP (bcm_find_op()) nor TX_DELETE (bcm_delete_tx_op()) could\never find it again, since both require an exact ifindex match.",
  "id": "GHSA-7g3q-gx5w-5qp5",
  "modified": "2026-08-19T18:32:27Z",
  "published": "2026-08-15T06:32:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72116"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b762c0d950383ab7a002686c9136b9aa55d2d70"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/60d8a7942f4ed2d975207aaeba1adb576707e53d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6be3e1fedf03eab36a2c09d755d1171287b2014b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9517d8fb0b191398d35b9b7f8c719c1cc7761cb1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b31d0933509c5a35c0be5736a2ce8df0d1bf112c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca829677ffa2de5d79e06366e19ac1e4f5cc78dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d30a36066ed3abefb72ae18901f71841ba18b350"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f749e4564952d60e96930c09f2be99955d07c22e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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