{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72120",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72120"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "can: bcm: add missing rcu list annotations and operations",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: add missing rcu list annotations and operations\n\nsashiko-bot remarked the missing use of list_add_rcu() in\nbcm_[rx|tx]_setup() to have a proper initialized bcm_op structure\nwhen bcm_proc_show() traverses the bcm_op's under rcu_read_lock().\n\nTo cover all initial settings of the bcm_op's the list_add_rcu() calls\nare moved to the end of the setup code.\n\nWhile at it, also fix the mirroring removal side: bcm_release() called\nbcm_remove_op() - which frees the op via call_rcu() - on ops that were\nstill linked in bo->tx_ops/bo->rx_ops, without list_del_rcu() first.\nUnlink each op with list_del_rcu() before handing it to bcm_remove_op(),\nmatching the existing pattern in bcm_delete_tx_op()/bcm_delete_rx_op().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72120"
    },
    {
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      "url": "https://git.kernel.org/stable/c/8357255e56dc1aaa437e3c53ee9385de984e0d57"
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      "url": "https://git.kernel.org/stable/c/f53bdab85e64eb57d6899a30d1307fd5a3639cc7"
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      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires local syscalls (socket/connect/sendmsg/close on PF_CAN/CAN_BCM) and/or reading /proc/net/can-bcm/<inode>; the bug is in RCU list management and procfs traversal, not in remote CAN frame reception.\nAC:L - The attacker controls both sides of the race\u2014concurrent TX_SETUP/RX_SETUP or socket close while repeatedly reading the world-readable proc entry\u2014so the UAF in bcm_proc_show is reliably triggerable without external timing luck.\nPR:L - PF_CAN CAN_BCM sockets are created and connected without capability checks; RX_SETUP works with ifindex 0 (no bound CAN device), so any unprivileged local user can create ops and race procfs reads on automotive, industrial, and embedded systems with CONFIG_CAN_BCM.\nUI:N - No victim interaction is required; the attacker drives the full exploit sequence (socket setup, opcode installation, proc reads, and socket teardown) from their own local process threads.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security domain; impact is local privilege escalation or crash, not crossing a VM, container, or IOMMU security boundary.\nC:H - bcm_proc_show dereferences bcm_op fields (can_id, flags, timers, counters) from list entries that may already be freed via call_rcu in bcm_remove_op, enabling kernel heap memory disclosure and further exploitation primitives.\nI:H - Freed bcm_op structures are kmalloc heap objects containing list_head links, sock pointers, and hrtimer state; UAF combined with heap spraying can yield arbitrary kernel writes and control-flow hijack for privilege escalation.\nA:H - Concurrent procfs traversal of tx_ops/rx_ops lists containing stale pointers to RCU-freed bcm_op objects can cause kernel oops/panic during list walking or field access, and UAF exploitation attempts can also crash the system."
    }
  }
}