{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-36013",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-36013"
  ],
  "published": "2024-05-23T07:03:23Z",
  "summary": "Bluetooth: L2CAP: Fix slab-use-after-free in l2cap_connect()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix slab-use-after-free in l2cap_connect()\n\nExtend a critical section to prevent chan from early freeing.\nAlso make the l2cap_connect() return type void. Nothing is using the\nreturned value but it is ugly to return a potentially freed pointer.\nMaking it void will help with backports because earlier kernels did use\nthe return value. Now the compile will break for kernels where this\npatch is not a complete fix.\n\nCall stack summary:\n\n[use]\nl2cap_bredr_sig_cmd\n  l2cap_connect\n  \u250c mutex_lock(&conn->chan_lock);\n  \u2502 chan = pchan->ops->new_connection(pchan); <- alloc chan\n  \u2502 __l2cap_chan_add(conn, chan);\n  \u2502   l2cap_chan_hold(chan);\n  \u2502   list_add(&chan->list, &conn->chan_l);   ... (1)\n  \u2514 mutex_unlock(&conn->chan_lock);\n    chan->conf_state              ... (4) <- use after free\n\n[free]\nl2cap_conn_del\n\u250c mutex_lock(&conn->chan_lock);\n\u2502 foreach chan in conn->chan_l:            ... (2)\n\u2502   l2cap_chan_put(chan);\n\u2502     l2cap_chan_destroy\n\u2502       kfree(chan)               ... (3) <- chan freed\n\u2514 mutex_unlock(&conn->chan_lock);\n\n==================================================================\nBUG: KASAN: slab-use-after-free in instrument_atomic_read\ninclude/linux/instrumented.h:68 [inline]\nBUG: KASAN: slab-use-after-free in _test_bit\ninclude/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]\nBUG: KASAN: slab-use-after-free in l2cap_connect+0xa67/0x11a0\nnet/bluetooth/l2cap_core.c:4260\nRead of size 8 at addr ffff88810bf040a0 by task kworker/u3:1/311",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-36013"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8629a65a48890769c47ebc9b6e57c02a80a8975e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cfe560c7050bfb37b0d2491bbe7cd8b59e77fdc5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/826af9d2f69567c646ff46d10393d47e30ad23c6"
    },
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      "type": "FIX",
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    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z"
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}