{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-40995",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-40995"
  ],
  "published": "2024-07-12T12:38:02Z",
  "summary": "net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc()\n\nsyzbot found hanging tasks waiting on rtnl_lock [1]\n\nA reproducer is available in the syzbot bug.\n\nWhen a request to add multiple actions with the same index is sent, the\nsecond request will block forever on the first request. This holds\nrtnl_lock, and causes tasks to hang.\n\nReturn -EAGAIN to prevent infinite looping, while keeping documented\nbehavior.\n\n[1]\n\nINFO: task kworker/1:0:5088 blocked for more than 143 seconds.\nNot tainted 6.9.0-rc4-syzkaller-00173-g3cdb45594619 #0\n\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\ntask:kworker/1:0 state:D stack:23744 pid:5088 tgid:5088 ppid:2 flags:0x00004000\nWorkqueue: events_power_efficient reg_check_chans_work\nCall Trace:\n<TASK>\ncontext_switch kernel/sched/core.c:5409 [inline]\n__schedule+0xf15/0x5d00 kernel/sched/core.c:6746\n__schedule_loop kernel/sched/core.c:6823 [inline]\nschedule+0xe7/0x350 kernel/sched/core.c:6838\nschedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895\n__mutex_lock_common kernel/locking/mutex.c:684 [inline]\n__mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752\nwiphy_lock include/net/cfg80211.h:5953 [inline]\nreg_leave_invalid_chans net/wireless/reg.c:2466 [inline]\nreg_check_chans_work+0x10a/0x10e0 net/wireless/reg.c:2481",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-40995"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74"
    },
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      "url": "https://git.kernel.org/stable/c/c6a7da65a296745535a964be1019ec7691b0cb90"
    },
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      "url": "https://git.kernel.org/stable/c/25987a97eec4d5f897cd04ee1b45170829c610da"
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      "url": "https://git.kernel.org/stable/c/6fc78d67f51aeb9a542d39a8714e16bc411582d4"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5f926aa96b08b6c47178fe1171e7ae331c695fc2"
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      "url": "https://git.kernel.org/stable/c/7a0e497b597df7c4cf2b63fc6e9188b6cabe5335"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
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}