HighFix available

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

Type: advisorySources: OSV

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.

Products: Kernel
Affected versions: Not specified
Fixed versions: 5.10.265, 5.15.216, 6.1.183, 6.12.101, 6.18.42, 6.6.148, 7.1.5
CVEs: CVE-2026-72116
Confirmed fixed CVEs: Not specified
Updated in this feed: 6 Nov 2026, 02:48 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 15 Aug 2026, 05:52 UTC

osv:CVE-2026-72116

Kernel

Fixed versions: 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.5

Complete source record

{
  "id": "944fd95793dfad751e15f905482d8bf19977f411938d8e1b512ae4b603edc467",
  "url": "https://osv.dev/vulnerability/CVE-2026-72116",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "can: bcm: fix stale rx/tx ops after device removal",
    "summary": "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.",
    "evidence": "osv:CVE-2026-72116",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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          {
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    "severity": "high",
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"
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      "affected": [
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                {
                  "introduced": "2.6.25"
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            {
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      ],
      "modified": "2026-10-28T02:30:46.326109315Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3b762c0d950383ab7a002686c9136b9aa55d2d70",
        "https://git.kernel.org/stable/c/60d8a7942f4ed2d975207aaeba1adb576707e53d",
        "https://git.kernel.org/stable/c/6be3e1fedf03eab36a2c09d755d1171287b2014b",
        "https://git.kernel.org/stable/c/9517d8fb0b191398d35b9b7f8c719c1cc7761cb1",
        "https://git.kernel.org/stable/c/b31d0933509c5a35c0be5736a2ce8df0d1bf112c",
        "https://git.kernel.org/stable/c/ca829677ffa2de5d79e06366e19ac1e4f5cc78dd",
        "https://git.kernel.org/stable/c/d30a36066ed3abefb72ae18901f71841ba18b350",
        "https://git.kernel.org/stable/c/f749e4564952d60e96930c09f2be99955d07c22e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72116.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72116",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72116.json"
      }
    },
    "related_cves": [
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        "value": "CVE-2026-72116",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514412,
  "published_at": "2026-08-15T05:52:56.26+00:00"
}