{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-35963",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-35963"
  ],
  "published": "2024-05-20T09:42:41Z",
  "summary": "Bluetooth: hci_sock: Fix not validating setsockopt user input",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sock: Fix not validating setsockopt user input\n\nCheck user input length before copying data.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
    }
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-35963"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/781f3a97a38a338bc893b6db7f9f9670bf1a9e37"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0c18a64039aa3f1c16f208d197c65076da798137"
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    {
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      "url": "https://git.kernel.org/stable/c/50173882bb187e70e37bac01385b9b114019bee2"
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    {
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      "url": "https://git.kernel.org/stable/c/b2186061d6043d6345a97100460363e990af0d46"
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    "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": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The flaw is reached purely through setsockopt(2)/getsockopt(2) on a locally created AF_BLUETOOTH/BTPROTO_HCI socket; no Bluetooth radio traffic, paired peer, or HCI adapter link participates in reaching the unvalidated copy.\nAC:L - Triggering is fully deterministic \u2014 issue setsockopt(fd, SOL_HCI, HCI_DATA_DIR, buf, optlen<4) or setsockopt(fd, SOL_BLUETOOTH, BT_SNDMTU, buf, optlen<2); there is no race, no timing window, and the attacker can groom the kmalloc-8/16 slab to choose what sits past the allocation.\nPR:L - bt_sock_create() and hci_sock_create() contain no capability check and the socket defaults to HCI_CHANNEL_RAW, so any unprivileged local user reaches hci_sock_setsockopt_old() with no bind and no caps; CAP_NET_RAW only narrows the filter masks, and HCI_CHANNEL_CONTROL binding for the BT_SNDMTU path is explicitly allowed for untrusted users.\nUI:N - The attacker performs every step on its own socket \u2014 create, bind, setsockopt, getsockopt; no victim action, mount, or file open is required.\nS:U - The out-of-bounds access stays within kernel slab memory under the same security authority, crossing no VM, IOMMU, or sandbox boundary.\nC:H - This is an out-of-bounds read of kernel heap memory past the end of the exact-size kernel_optval allocation, and the disclosed bytes flow straight back to userspace \u2014 hci_sock_getsockopt() put_user()s hci_pi(sk)->mtu verbatim, yielding a repeatable 16-bit kernel-heap oracle (plus a bit-oracle via HCI_DATA_DIR/HCI_TIME_STAMP) usable with heap grooming to leak kernel data and defeat KASLR.\nI:N - Nothing is written out of bounds; the only state changed is the attacker's own socket cmsg_mask, filter, and mtu, all of which are settable through the normal API anyway, so no data outside the attacker's authority is modified.\nA:H - The slab out-of-bounds read raises a KASAN BUG that panics outright under the widely deployed panic_on_warn configuration, and the read can fault when it crosses into a KFENCE guard page or unmapped page, producing a kernel oops that an unprivileged local user can repeat at will."
    }
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}