{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72119",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72119"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "can: bcm: extend bcm_tx_lock usage for data and timer updates",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: extend bcm_tx_lock usage for data and timer updates\n\nStage new CAN frame content for an existing tx op into a kmalloc()'d\nbuffer and validate it there, mirroring the approach already used in\nbcm_rx_setup(). Only copy the validated data into op->frames while\nholding op->bcm_tx_lock, so bcm_can_tx() and bcm_tx_timeout_handler()\ncan no longer observe a partially updated or unvalidated frame.\n\nAdd a missing error path for memcpy_from_msg() when copying CAN frame\ndata from userspace.\n\nAlso move the kt_ival1/kt_ival2/ival1/ival2 updates in bcm_tx_setup()\nunder op->bcm_tx_lock, and read kt_ival1/kt_ival2/count under the same\nlock in bcm_tx_set_expiry() and bcm_tx_timeout_handler(), closing the\ntorn 64-bit ktime_t read on 32-bit platforms.",
  "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-2026-72119"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a538b072ee074c9b41b9d9c15a6861a963e30755"
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      "url": "https://git.kernel.org/stable/c/63422347b4c782f429748b2a09cd3cf3b77e6abd"
    },
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      "url": "https://git.kernel.org/stable/c/37917e432e50b7de2b64230974380132a30f7270"
    },
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      "url": "https://git.kernel.org/stable/c/52f06e7603780de100233713ddaf971d422e10ef"
    },
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      "url": "https://git.kernel.org/stable/c/972fd66bb08fdef1090abe43196ca8da07216d13"
    },
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      "url": "https://git.kernel.org/stable/c/bd46f55dec608daa44b45dcf3328517630ad8e40"
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      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached only through PF_CAN/CAN_BCM socket sendmsg() TX_SETUP updates racing hrtimer-driven bcm_can_tx(); it is not triggered by remote network services or CAN bus traffic alone.\nAC:L - The attacker controls both sides of the race by creating cyclic TX ops with STARTTIMER/SETTIMER and repeatedly issuing TX_SETUP while the softirq hrtimer fires, making the window reliably winnable without external timing luck.\nPR:L - bcm_sendmsg()/bcm_connect() enforce no capability checks; any local user with access to a CAN interface (including vcan created with CAP_NET_ADMIN inside an unprivileged user namespace) can open BCM sockets and drive TX_SETUP.\nUI:N - Exploitation requires only the attacker opening a BCM socket and sending TX_SETUP messages; no victim interaction such as mounting filesystems or opening files is needed.\nS:U - Impact is confined to kernel memory/state corruption and local privilege effects on the host running CAN BCM; it does not cross a VM, container, or IOMMU security boundary by itself.\nC:H - Racing updates can let bcm_can_tx() transmit partially updated or unvalidated frames (e.g., len>64) before bcm_tx_setup() rejects them, and many CAN driver xmit paths memcpy(cf->data, cf->len) trusting len, causing kernel out-of-bounds reads.\nI:H - Concurrent unsynchronized writes to op->frames, flags, count, and ktime_t timer fields corrupt shared in-kernel BCM state that directly feeds skb construction and driver transmission, providing attacker-influenced memory corruption primitives.\nA:H - Observing torn/unvalidated frames in bcm_can_tx() during active timers can trigger kernel WARN/Oops/panic via out-of-bounds accesses in CAN drivers, and torn ktime_t/count reads can disrupt cyclic transmission causing denial of service."
    }
  }
}