[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"repo-stars":3,"vuln-CVE-2021-47284":6},{"stargazers_count":4,"fetched_at":5},7,"2026-06-04T08:53:30.047Z",{"id":7,"descriptions":8,"cisa":9,"weaknesses":10,"exploits":86,"aliases":87,"duplicate_of":9,"upstream":88,"downstream":89,"duplicates":110,"related":111,"reserved_at":9,"published_at":118,"modified_at":119,"state":120,"summary":121,"references_raw":130,"kevs":165,"epss":166,"epss_history":169,"metrics":392,"affected":400},"CVE-2021-47284","In the Linux kernel, the following vulnerability has been resolved:\n\nisdn: mISDN: netjet: Fix crash in nj_probe:\n\n'nj_setup' in netjet.c might fail with -EIO and in this case\n'card->irq' is initialized and is bigger than zero. A subsequent call to\n'nj_release' will free the irq that has not been requested.\n\nFix this bug by deleting the previous assignment to 'card->irq' and just\nkeep the assignment before 'request_irq'.\n\nThe KASAN's log reveals it:\n\n[    3.354615 ] WARNING: CPU: 0 PID: 1 at kernel/irq/manage.c:1826\nfree_irq+0x100/0x480\n[    3.355112 ] Modules linked in:\n[    3.355310 ] CPU: 0 PID: 1 Comm: swapper/0 Not tainted\n5.13.0-rc1-00144-g25a1298726e #13\n[    3.355816 ] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS\nrel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014\n[    3.356552 ] RIP: 0010:free_irq+0x100/0x480\n[    3.356820 ] Code: 6e 08 74 6f 4d 89 f4 e8 5e ac 09 00 4d 8b 74 24 18\n4d 85 f6 75 e3 e8 4f ac 09 00 8b 75 c8 48 c7 c7 78 c1 2e 85 e8 e0 cf f5\nff \u003C0f> 0b 48 8b 75 c0 4c 89 ff e8 72 33 0b 03 48 8b 43 40 4c 8b a0 80\n[    3.358012 ] RSP: 0000:ffffc90000017b48 EFLAGS: 00010082\n[    3.358357 ] RAX: 0000000000000000 RBX: ffff888104dc8000 RCX:\n0000000000000000\n[    3.358814 ] RDX: ffff8881003c8000 RSI: ffffffff8124a9e6 RDI:\n00000000ffffffff\n[    3.359272 ] RBP: ffffc90000017b88 R08: 0000000000000000 R09:\n0000000000000000\n[    3.359732 ] R10: ffffc900000179f0 R11: 0000000000001d04 R12:\n0000000000000000\n[    3.360195 ] R13: ffff888107dc6000 R14: ffff888107dc6928 R15:\nffff888104dc80a8\n[    3.360652 ] FS:  0000000000000000(0000) GS:ffff88817bc00000(0000)\nknlGS:0000000000000000\n[    3.361170 ] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[    3.361538 ] CR2: 0000000000000000 CR3: 000000000582e000 CR4:\n00000000000006f0\n[    3.362003 ] DR0: 0000000000000000 DR1: 0000000000000000 DR2:\n0000000000000000\n[    3.362175 ] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:\n0000000000000400\n[    3.362175 ] Call Trace:\n[    3.362175 ]  nj_release+0x51/0x1e0\n[    3.362175 ]  nj_probe+0x450/0x950\n[    3.362175 ]  ? pci_device_remove+0x110/0x110\n[    3.362175 ]  local_pci_probe+0x45/0xa0\n[    3.362175 ]  pci_device_probe+0x12b/0x1d0\n[    3.362175 ]  really_probe+0x2a9/0x610\n[    3.362175 ]  driver_probe_device+0x90/0x1d0\n[    3.362175 ]  ? mutex_lock_nested+0x1b/0x20\n[    3.362175 ]  device_driver_attach+0x68/0x70\n[    3.362175 ]  __driver_attach+0x124/0x1b0\n[    3.362175 ]  ? device_driver_attach+0x70/0x70\n[    3.362175 ]  bus_for_each_dev+0xbb/0x110\n[    3.362175 ]  ? rdinit_setup+0x45/0x45\n[    3.362175 ]  driver_attach+0x27/0x30\n[    3.362175 ]  bus_add_driver+0x1eb/0x2a0\n[    3.362175 ]  driver_register+0xa9/0x180\n[    3.362175 ]  __pci_register_driver+0x82/0x90\n[    3.362175 ]  ? w6692_init+0x38/0x38\n[    3.362175 ]  nj_init+0x36/0x38\n[    3.362175 ]  do_one_initcall+0x7f/0x3d0\n[    3.362175 ]  ? rdinit_setup+0x45/0x45\n[    3.362175 ]  ? rcu_read_lock_sched_held+0x4f/0x80\n[    3.362175 ]  kernel_init_freeable+0x2aa/0x301\n[    3.362175 ]  ? rest_init+0x2c0/0x2c0\n[    3.362175 ]  kernel_init+0x18/0x190\n[    3.362175 ]  ? rest_init+0x2c0/0x2c0\n[    3.362175 ]  ? rest_init+0x2c0/0x2c0\n[    3.362175 ]  ret_from_fork+0x1f/0x30\n[    3.362175 ] Kernel panic - not syncing: panic_on_warn set ...\n[    3.362175 ] CPU: 0 PID: 1 Comm: swapper/0 Not tainted\n5.13.0-rc1-00144-g25a1298726e #13\n[    3.362175 ] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS\nrel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014\n[    3.362175 ] Call Trace:\n[    3.362175 ]  dump_stack+0xba/0xf5\n[    3.362175 ]  ? free_irq+0x100/0x480\n[    3.362175 ]  panic+0x15a/0x3f2\n[    3.362175 ]  ? __warn+0xf2/0x150\n[    3.362175 ]  ? free_irq+0x100/0x480\n[    3.362175 ]  __warn+0x108/0x150\n[    3.362175 ]  ? free_irq+0x100/0x480\n[    3.362175 ]  report_bug+0x119/0x1c0\n[    3.362175 ]  handle_bug+0x3b/0x80\n[    3.362175 ]  exc_invalid_op+0x18/0x70\n[    3.362175 ]  asm_exc_invalid_op+0x12/0x20\n[    3.362175 ] RIP: 0010:free_irq+0x100\n---truncated---",null,[11],{"_key":12,"id":12,"name":13,"description":14,"type":15,"status":16,"abstraction":17,"likelihood_of_exploit":18,"capec":19},"CWE-400","Uncontrolled Resource Consumption","The product does not properly control the allocation and maintenance of a limited resource.","weakness","Draft","Class","High",[20,24,82],{"id":21,"name":22,"techniques":23},"CAPEC-147","XML Ping of the Death",[],{"id":25,"name":26,"techniques":27},"CAPEC-227","Sustained Client Engagement",[28],{"id":29,"name":30,"tactics":31,"countermeasures":35},"T1499","Endpoint Denial of Service",[32],{"id":33,"name":34},"TA0105","Impact",[36,41,45,49,53,57,61,65,69,73,78],{"id":37,"name":38,"tactic":39},"D3-UGLPA","User Geolocation Logon Pattern Analysis",{"name":40},"Detect",{"id":42,"name":43,"tactic":44},"D3-PMAD","Protocol Metadata Anomaly Detection",{"name":40},{"id":46,"name":47,"tactic":48},"D3-CSPP","Client-server Payload 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