{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72122",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72122"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "can: bcm: fix lockless bound/ifindex race and silent RX_SETUP failure",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: fix lockless bound/ifindex race and silent RX_SETUP failure\n\nbcm_sendmsg() reads bo->ifindex and checks bo->bound before taking\nlock_sock(), while bcm_notify(), bcm_connect() and bcm_release() all\nmutate both fields under that same lock. Because the lockless reads\nand the locked writes are unordered with respect to each other, a\nracing bcm_notify() (device unregister) or bcm_connect() (concurrent\nbind on another thread sharing the socket) can make bcm_sendmsg()\nobserve an inconsistent combination, e.g. a stale bound=1 together\nwith the now-cleared ifindex=0, silently turning a socket bound to a\nspecific CAN interface into one that also matches \"any\" interface.\n\nKeep the lockless bo->bound check purely as a fast-path reject, and\nmove the ifindex read (and a bo->bound re-check) into the locked\nsection, where every writer already serializes. This removes the\npossibility of observing the two fields torn against each other,\nrather than trying to fix it with more READ_ONCE()/WRITE_ONCE() pairs\non two independently updated fields. Annotate the now-purely-lockless\nbo->bound accesses consistently across all its write sites.\n\nAlso fix bcm_rx_setup() silently returning success when the target\ndevice disappears concurrently instead of reporting -ENODEV, so a\nbroken RX op is no longer left registered as if it had succeeded.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L"
    }
  ],
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    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72122"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9e60c586faeaed80d55ab8ce2a4b8e56133bc395"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ffa80a2af27c97453861a5128e537214a31cd18a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6bcc5cd247c2934373bc2a1cdf8bf12321169543"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0f6f9f95294b4cbb26ba02209e893e3bd91237c3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b70f1a15533afeeec5d07f20bec3f3867ab1c7b6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/35f0ac19efb1a3f6c5e12c00e475a9ec2d9c3a6d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b9c6ac6fb4e01b34575816066e5d3890a57b3c86"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d9b091d9d22fee81ec53fb55d2032951993ceadb"
    }
  ],
  "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": 7.3,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires local access to a PF_CAN SOCK_DGRAM CAN_BCM socket via sendmsg()/connect() syscalls; the race is in kernel socket state handling, not in remote packet reception or the physical CAN bus itself.\nAC:L - The attacker controls both sides of the race by concurrently calling sendmsg() on one thread while triggering bcm_connect() or NETDEV_UNREGISTER (e.g. ip link del) on another, making the torn bound/ifindex observation reliably triggerable.\nPR:L - No real-root capability is required beyond opening BCM sockets and binding to a CAN interface; unprivileged users with CAN access or CAP_NET_ADMIN via user namespaces can create vcan devices and drive the unregister/connect race.\nUI:N - Exploitation is fully attacker-driven through concurrent syscalls and does not require any victim user action such as mounting filesystems or opening files.\nS:U - The impact is unauthorized access to additional CAN interfaces within the same kernel security domain, not a cross-boundary escape such as VM breakout, sandbox escape, or IOMMU bypass.\nC:H - Racing to observe bound=1 with ifindex=0 causes RX_SETUP to register can_rx_register() on all CAN devices, letting a socket bound to one interface sniff traffic from every other CAN bus on the system including safety-critical vehicle or industrial networks.\nI:H - The same torn state enables TX_SETUP/TX_SEND on arbitrary interfaces via msg_name when per-socket binding would normally block it, allowing injection of attacker-controlled CAN frames onto buses the process was not authorized to transmit on.\nA:L - The concurrent bcm_rx_setup() bug can silently return success without registering a filter when the target device vanishes, degrading CAN monitoring reliability without causing kernel panic, oops, or deadlock."
    }
  }
}