{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72126",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72126"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "can: isotp: use unconditional synchronize_rcu() in isotp_release()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: isotp: use unconditional synchronize_rcu() in isotp_release()\n\nisotp_notify() unregisters the (RCU) CAN filters via can_rx_unregister()\nand clears so->bound without waiting for a grace period. isotp_release()\nuses so->bound to decide whether it needs to call synchronize_rcu()\nbefore cancelling so->rxtimer, so when NETDEV_UNREGISTER runs first it\nskips that synchronize_rcu() and can cancel the timer while an\nin-flight isotp_rcv() is still executing and about to re-arm it via\nisotp_send_fc(), leading to a use-after-free timer callback on the\nfreed socket.\n\nsakisho-bot remarked a problem with rtnl_lock held in isotp_notify(),\ntherefore make isotp_release() always call synchronize_rcu() before\ncancelling the timers, regardless of so->bound. This still closes the\noriginal race (isotp_notify() clearing so->bound without waiting for\nin-flight isotp_rcv() callers before isotp_release() cancels the RX\ntimer) without adding any RCU wait to the netdevice notifier path.",
  "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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          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72126"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/945d9894502cd9124f5d676181c542ed2000f7c0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/59672aa4bcd8d32172c1ff6a179583981d6acabc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/15413a082df69175c2f96aeab4c26fe1ff7cff03"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6280eda96e0707264849fa7d036fed873c1f8a6d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cb6abc584a1bfab107ac003d64948a4aef1730aa"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b88a511308779c225005d7994b8744561bdbafbc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b8278ff605187ef3fa0f2705e93251cce4c4f8ee"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9b1a02e0d980ac6b0e36a90378f847062f81d7e4"
    }
  ],
  "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": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The UAF is reached through local AF_CAN CAN_ISOTP socket syscalls (socket/bind/close) racing in-kernel ISO-TP RX; a CAN peer can deliver frames, but exploitation requires a local process to close the socket while NETDEV_UNREGISTER clears so->bound.\nAC:L - The attacker controls all race sides: ISO-TP RX traffic via a local CAN socket or bus peer, concurrent close() on the ISOTP socket, and NETDEV_UNREGISTER by deleting the bound vcan/CAN interface (e.g., in a user namespace with CAP_NET_ADMIN).\nPR:L - CAN_ISOTP socket create/bind/sendmsg/close paths impose no CAP_NET_ADMIN check; an unprivileged local user with access to a CAN netdev, including a user-namespace vcan they create, can reach the vulnerable release/timer path.\nUI:N - No victim interaction is required once the attacker can execute local code; they can open the ISO-TP socket, drive RX via CAN frames, delete the netdev, and close the socket to race isotp_rcv() against isotp_release().\nS:U - Exploitation corrupts kernel heap memory within the same OS security boundary (standard kernel UAF), not a VM/host or IOMMU sandbox escape.\nC:H - Use-after-free of struct isotp_sock in isotp_rx_timer_handler reads freed memory (so->rx.state, sock fields), enabling heap grooming for arbitrary kernel memory disclosure per conservative UAF scoring guidance.\nI:H - The timer callback performs writes to fields within the freed isotp_sock/socket object, giving attacker-influenced kernel heap corruption that can be developed into arbitrary write or privilege-escalation primitives.\nA:H - Executing isotp_rx_timer_handler on a freed socket can cause kernel oops/panic or fatal memory corruption; the UAF is reliably triggerable with attacker-controlled timing."
    }
  }
}