{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50124",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-50124"
  ],
  "published": "2024-11-05T17:11:07Z",
  "summary": "Bluetooth: ISO: Fix UAF on iso_sock_timeout",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: Fix UAF on iso_sock_timeout\n\nconn->sk maybe have been unlinked/freed while waiting for iso_conn_lock\nso this checks if the conn->sk is still valid by checking if it part of\niso_sk_list.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/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-2024-50124"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/876ac72d535fa94f4ac57bba651987c6f990f646"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/14bcb721d241e62fdd18f6f434a2ed2ab6e71a9b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d75aad1d3143ca68cda52ff80ac392e1bbd84325"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/246b435ad668596aa0e2bbb9d491b6413861211a"
    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.0,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The vulnerable `iso_conn` and its `timeout_work` exist only while a real ISO/CIS/BIS link or PA sync is established with an in-range Bluetooth LE Audio peer, and the second patched call site `iso_conn_del()` is driven directly by `iso_connect_cfm`/`iso_disconn_cfm` from adjacent-device HCI events. Bluetooth radio proximity is required, matching the Adjacent classification.\nAC:L - The attacker controls both sides of the race: `SO_SNDTIMEO` sets `sk->sk_sndtimeo`, which `iso_connect_cis()`/`iso_connect_bis()` pass verbatim to `iso_sock_set_timer()`, so the timeout work can be scheduled to fire at an arbitrarily chosen moment and raced against `close()`, and `iso_sock_clear_timer()` uses non-sync `cancel_delayed_work()` so an in-flight work item is never waited for. The sequence is freely repeatable until it wins.\nPR:L - There is no `capable()` or `CAP_NET_*` check anywhere in `bt_sock_create()`, `iso_sock_create()`, `iso_sock_bind()`, `iso_sock_listen()` or `iso_sock_connect()`, so any unprivileged local user can create BTPROTO_ISO sockets and drive the connect/close sequence that frees the socket. Only basic local account access is needed, not root.\nUI:N - The whole sequence \u2014 socket creation, `SO_SNDTIMEO`, connect/listen, close \u2014 is performed by the attacker's own process against the system Bluetooth adapter. No victim action is required.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `iso_proto` is registered with `proto_register(&iso_proto, 0)`, so `struct iso_pinfo` is allocated from the generic kmalloc caches; the attacker can respray the freed object and read its contents back through subsequent socket operations, giving a path to arbitrary kernel memory disclosure.\nI:H - The stale pointer is written through \u2014 `sock_hold()` performs an atomic increment on freed memory and `sk->sk_err = ETIMEDOUT` writes into it \u2014 and `sk->sk_state_change(sk)` performs an indirect call through a function pointer read from the freed object, providing a control-flow hijack primitive.\nA:H - Even without successful exploitation the UAF produces a KASAN splat, oops, or panic inside `iso_sock_timeout()` running on the system workqueue, and it can be triggered repeatedly by an unprivileged process."
    }
  }
}