{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2021-47271",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: cdnsp: Fix deadlock issue in cdnsp_thread_irq_handler\n\nPatch fixes the following critical issue caused by deadlock which has been\ndetected during testing NCM class:\n\nsmp: csd: Detected non-responsive CSD lock (#1) on CPU#0\nsmp:     csd: CSD lock (#1) unresponsive.\n....\nRIP: 0010:native_queued_spin_lock_slowpath+0x61/0x1d0\nRSP: 0018:ffffbc494011cde0 EFLAGS: 00000002\nRAX: 0000000000000101 RBX: ffff9ee8116b4a68 RCX: 0000000000000000\nRDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff9ee8116b4658\nRBP: ffffbc494011cde0 R08: 0000000000000001 R09: 0000000000000000\nR10: ffff9ee8116b4670 R11: 0000000000000000 R12: ffff9ee8116b4658\nR13: ffff9ee8116b4670 R14: 0000000000000246 R15: ffff9ee8116b4658\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f7bcc41a830 CR3: 000000007a612003 CR4: 00000000001706e0\nCall Trace:\n <IRQ>\n do_raw_spin_lock+0xc0/0xd0\n _raw_spin_lock_irqsave+0x95/0xa0\n cdnsp_gadget_ep_queue.cold+0x88/0x107 [cdnsp_udc_pci]\n usb_ep_queue+0x35/0x110\n eth_start_xmit+0x220/0x3d0 [u_ether]\n ncm_tx_timeout+0x34/0x40 [usb_f_ncm]\n ? ncm_free_inst+0x50/0x50 [usb_f_ncm]\n __hrtimer_run_queues+0xac/0x440\n hrtimer_run_softirq+0x8c/0xb0\n __do_softirq+0xcf/0x428\n asm_call_irq_on_stack+0x12/0x20\n </IRQ>\n do_softirq_own_stack+0x61/0x70\n irq_exit_rcu+0xc1/0xd0\n sysvec_apic_timer_interrupt+0x52/0xb0\n asm_sysvec_apic_timer_interrupt+0x12/0x20\nRIP: 0010:do_raw_spin_trylock+0x18/0x40\nRSP: 0018:ffffbc494138bda8 EFLAGS: 00000246\nRAX: 0000000000000000 RBX: ffff9ee8116b4658 RCX: 0000000000000000\nRDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff9ee8116b4658\nRBP: ffffbc494138bda8 R08: 0000000000000001 R09: 0000000000000000\nR10: ffff9ee8116b4670 R11: 0000000000000000 R12: ffff9ee8116b4658\nR13: ffff9ee8116b4670 R14: ffff9ee7b5c73d80 R15: ffff9ee8116b4000\n _raw_spin_lock+0x3d/0x70\n ? cdnsp_thread_irq_handler.cold+0x32/0x112c [cdnsp_udc_pci]\n cdnsp_thread_irq_handler.cold+0x32/0x112c [cdnsp_udc_pci]\n ? cdnsp_remove_request+0x1f0/0x1f0 [cdnsp_udc_pci]\n ? cdnsp_thread_irq_handler+0x5/0xa0 [cdnsp_udc_pci]\n ? irq_thread+0xa0/0x1c0\n irq_thread_fn+0x28/0x60\n irq_thread+0x105/0x1c0\n ? __kthread_parkme+0x42/0x90\n ? irq_forced_thread_fn+0x90/0x90\n ? wake_threads_waitq+0x30/0x30\n ? irq_thread_check_affinity+0xe0/0xe0\n kthread+0x12a/0x160\n ? kthread_park+0x90/0x90\n ret_from_fork+0x22/0x30\n\nThe root cause of issue is spin_lock/spin_unlock instruction instead\nspin_lock_irqsave/spin_lock_irqrestore in cdnsp_thread_irq_handler\nfunction."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "3d82904559f4",
                                            "version_value": "ae746b6f4ce6"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "5.12",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "5.12",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.12.11",
                                                        "lessThanOrEqual": "5.12.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.13",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/ae746b6f4ce619cf4032fd798a232b010907a397",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/ae746b6f4ce619cf4032fd798a232b010907a397"
            },
            {
                "url": "https://git.kernel.org/stable/c/a9aecef198faae3240921b707bc09b602e966fce",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/a9aecef198faae3240921b707bc09b602e966fce"
            }
        ]
    },
    "generator": {
        "engine": "bippy-a5840b7849dd"
    }
}