{"id":"CVE-2021-47271","state":"PUBLISHED","title":"usb: cdnsp: Fix deadlock issue in cdnsp_thread_irq_handler","description":"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.","publishedAt":"2024-05-21T14:20:00.703Z","updatedAt":"2026-05-11T13:51:16.818Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3d82904559f4f5a2622db1b21de3edf2eded7664","status":"affected","lessThan":"ae746b6f4ce619cf4032fd798a232b010907a397","versionType":"git"},{"version":"3d82904559f4f5a2622db1b21de3edf2eded7664","status":"affected","lessThan":"a9aecef198faae3240921b707bc09b602e966fce","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/cdns3/cdnsp-ring.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.12","versionType":"semver"},{"version":"5.12.11","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/cdns3/cdnsp-ring.c"]}],"references":["https://git.kernel.org/stable/c/ae746b6f4ce619cf4032fd798a232b010907a397","https://git.kernel.org/stable/c/a9aecef198faae3240921b707bc09b602e966fce"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47271.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47271","state":"PUBLISHED","datePublished":"2024-05-21T14:20:00.703Z","dateUpdated":"2026-05-11T13:51:16.818Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T13:27:52.127Z"},"containers":{"cna":{"title":"usb: cdnsp: Fix deadlock issue in cdnsp_thread_irq_handler","descriptions":[{"lang":"en","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3d82904559f4f5a2622db1b21de3edf2eded7664","status":"affected","lessThan":"ae746b6f4ce619cf4032fd798a232b010907a397","versionType":"git"},{"version":"3d82904559f4f5a2622db1b21de3edf2eded7664","status":"affected","lessThan":"a9aecef198faae3240921b707bc09b602e966fce","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/cdns3/cdnsp-ring.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.12","versionType":"semver"},{"version":"5.12.11","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/cdns3/cdnsp-ring.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ae746b6f4ce619cf4032fd798a232b010907a397"},{"url":"https://git.kernel.org/stable/c/a9aecef198faae3240921b707bc09b602e966fce"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:51:16.818Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"5.12.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"5.13"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2024-05-29T18:57:26.202334Z","id":"CVE-2021-47271","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"type":"CWE","lang":"en","description":"CWE-noinfo Not enough information"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-11-04T17:52:44.467Z"}},{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/ae746b6f4ce619cf4032fd798a232b010907a397","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/a9aecef198faae3240921b707bc09b602e966fce","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:32:08.126Z"}}]}}}