Vulnerability-Lookup

GHSA-7QVV-HM32-963P

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-11-04 21:30

Details

In the Linux kernel, the following vulnerability has been resolved:

usb: cdnsp: Fix deadlock issue in cdnsp_thread_irq_handler

Patch fixes the following critical issue caused by deadlock which has been detected during testing NCM class:

smp: csd: Detected non-responsive CSD lock (#1) on CPU#0 smp: csd: CSD lock (#1) unresponsive. .... RIP: 0010:native_queued_spin_lock_slowpath+0x61/0x1d0 RSP: 0018:ffffbc494011cde0 EFLAGS: 00000002 RAX: 0000000000000101 RBX: ffff9ee8116b4a68 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff9ee8116b4658 RBP: ffffbc494011cde0 R08: 0000000000000001 R09: 0000000000000000 R10: ffff9ee8116b4670 R11: 0000000000000000 R12: ffff9ee8116b4658 R13: ffff9ee8116b4670 R14: 0000000000000246 R15: ffff9ee8116b4658 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7bcc41a830 CR3: 000000007a612003 CR4: 00000000001706e0 Call Trace: do_raw_spin_lock+0xc0/0xd0 _raw_spin_lock_irqsave+0x95/0xa0 cdnsp_gadget_ep_queue.cold+0x88/0x107 [cdnsp_udc_pci] usb_ep_queue+0x35/0x110 eth_start_xmit+0x220/0x3d0 [u_ether] ncm_tx_timeout+0x34/0x40 [usb_f_ncm] ? ncm_free_inst+0x50/0x50 [usb_f_ncm] __hrtimer_run_queues+0xac/0x440 hrtimer_run_softirq+0x8c/0xb0 __do_softirq+0xcf/0x428 asm_call_irq_on_stack+0x12/0x20 do_softirq_own_stack+0x61/0x70 irq_exit_rcu+0xc1/0xd0 sysvec_apic_timer_interrupt+0x52/0xb0 asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0010:do_raw_spin_trylock+0x18/0x40 RSP: 0018:ffffbc494138bda8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff9ee8116b4658 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff9ee8116b4658 RBP: ffffbc494138bda8 R08: 0000000000000001 R09: 0000000000000000 R10: ffff9ee8116b4670 R11: 0000000000000000 R12: ffff9ee8116b4658 R13: ffff9ee8116b4670 R14: ffff9ee7b5c73d80 R15: ffff9ee8116b4000 _raw_spin_lock+0x3d/0x70 ? cdnsp_thread_irq_handler.cold+0x32/0x112c [cdnsp_udc_pci] cdnsp_thread_irq_handler.cold+0x32/0x112c [cdnsp_udc_pci] ? cdnsp_remove_request+0x1f0/0x1f0 [cdnsp_udc_pci] ? cdnsp_thread_irq_handler+0x5/0xa0 [cdnsp_udc_pci] ? irq_thread+0xa0/0x1c0 irq_thread_fn+0x28/0x60 irq_thread+0x105/0x1c0 ? __kthread_parkme+0x42/0x90 ? irq_forced_thread_fn+0x90/0x90 ? wake_threads_waitq+0x30/0x30 ? irq_thread_check_affinity+0xe0/0xe0 kthread+0x12a/0x160 ? kthread_park+0x90/0x90 ret_from_fork+0x22/0x30

The root cause of issue is spin_lock/spin_unlock instruction instead spin_lock_irqsave/spin_lock_irqrestore in cdnsp_thread_irq_handler function.

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47271"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:15Z",
    "severity": "MODERATE"
  },
  "details": "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 \u003cIRQ\u003e\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 \u003c/IRQ\u003e\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.",
  "id": "GHSA-7qvv-hm32-963p",
  "modified": "2024-11-04T21:30:26Z",
  "published": "2024-05-21T15:31:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47271"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9aecef198faae3240921b707bc09b602e966fce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae746b6f4ce619cf4032fd798a232b010907a397"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2021-47271 (GCVE-0-2021-47271)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:20 – Updated: 2026-05-11 13:51

Title

usb: cdnsp: Fix deadlock issue in cdnsp_thread_irq_handler

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: cdnsp: Fix deadlock issue in cdnsp_thread_irq_handler Patch fixes the following critical issue caused by deadlock which has been detected during testing NCM class: smp: csd: Detected non-responsive CSD lock (#1) on CPU#0 smp: csd: CSD lock (#1) unresponsive. .... RIP: 0010:native_queued_spin_lock_slowpath+0x61/0x1d0 RSP: 0018:ffffbc494011cde0 EFLAGS: 00000002 RAX: 0000000000000101 RBX: ffff9ee8116b4a68 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff9ee8116b4658 RBP: ffffbc494011cde0 R08: 0000000000000001 R09: 0000000000000000 R10: ffff9ee8116b4670 R11: 0000000000000000 R12: ffff9ee8116b4658 R13: ffff9ee8116b4670 R14: 0000000000000246 R15: ffff9ee8116b4658 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7bcc41a830 CR3: 000000007a612003 CR4: 00000000001706e0 Call Trace: <IRQ> do_raw_spin_lock+0xc0/0xd0 _raw_spin_lock_irqsave+0x95/0xa0 cdnsp_gadget_ep_queue.cold+0x88/0x107 [cdnsp_udc_pci] usb_ep_queue+0x35/0x110 eth_start_xmit+0x220/0x3d0 [u_ether] ncm_tx_timeout+0x34/0x40 [usb_f_ncm] ? ncm_free_inst+0x50/0x50 [usb_f_ncm] __hrtimer_run_queues+0xac/0x440 hrtimer_run_softirq+0x8c/0xb0 __do_softirq+0xcf/0x428 asm_call_irq_on_stack+0x12/0x20 </IRQ> do_softirq_own_stack+0x61/0x70 irq_exit_rcu+0xc1/0xd0 sysvec_apic_timer_interrupt+0x52/0xb0 asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0010:do_raw_spin_trylock+0x18/0x40 RSP: 0018:ffffbc494138bda8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff9ee8116b4658 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff9ee8116b4658 RBP: ffffbc494138bda8 R08: 0000000000000001 R09: 0000000000000000 R10: ffff9ee8116b4670 R11: 0000000000000000 R12: ffff9ee8116b4658 R13: ffff9ee8116b4670 R14: ffff9ee7b5c73d80 R15: ffff9ee8116b4000 _raw_spin_lock+0x3d/0x70 ? cdnsp_thread_irq_handler.cold+0x32/0x112c [cdnsp_udc_pci] cdnsp_thread_irq_handler.cold+0x32/0x112c [cdnsp_udc_pci] ? cdnsp_remove_request+0x1f0/0x1f0 [cdnsp_udc_pci] ? cdnsp_thread_irq_handler+0x5/0xa0 [cdnsp_udc_pci] ? irq_thread+0xa0/0x1c0 irq_thread_fn+0x28/0x60 irq_thread+0x105/0x1c0 ? __kthread_parkme+0x42/0x90 ? irq_forced_thread_fn+0x90/0x90 ? wake_threads_waitq+0x30/0x30 ? irq_thread_check_affinity+0xe0/0xe0 kthread+0x12a/0x160 ? kthread_park+0x90/0x90 ret_from_fork+0x22/0x30 The root cause of issue is spin_lock/spin_unlock instruction instead spin_lock_irqsave/spin_lock_irqrestore in cdnsp_thread_irq_handler function.

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-noinfo Not enough information

Assigner

Linux

References

2 references

URL	Tags
https://git.kernel.org/stable/c/ae746b6f4ce619cf4…
https://git.kernel.org/stable/c/a9aecef198faae324…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3d82904559f4f5a2622db1b21de3edf2eded7664 , < ae746b6f4ce619cf4032fd798a232b010907a397 (git) Affected: 3d82904559f4f5a2622db1b21de3edf2eded7664 , < a9aecef198faae3240921b707bc09b602e966fce (git)
Linux	Linux	Affected: 5.12 Unaffected: 0 , < 5.12 (semver) Unaffected: 5.12.11 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2021-47271",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-29T18:57:26.202334Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "description": "CWE-noinfo Not enough information",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-11-04T17:52:44.467Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:32:08.126Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/ae746b6f4ce619cf4032fd798a232b010907a397"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/a9aecef198faae3240921b707bc09b602e966fce"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/cdns3/cdnsp-ring.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ae746b6f4ce619cf4032fd798a232b010907a397",
              "status": "affected",
              "version": "3d82904559f4f5a2622db1b21de3edf2eded7664",
              "versionType": "git"
            },
            {
              "lessThan": "a9aecef198faae3240921b707bc09b602e966fce",
              "status": "affected",
              "version": "3d82904559f4f5a2622db1b21de3edf2eded7664",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/cdns3/cdnsp-ring.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "lessThan": "5.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.12.11",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.13",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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 \u003cIRQ\u003e\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 \u003c/IRQ\u003e\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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T13:51:16.818Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ae746b6f4ce619cf4032fd798a232b010907a397"
        },
        {
          "url": "https://git.kernel.org/stable/c/a9aecef198faae3240921b707bc09b602e966fce"
        }
      ],
      "title": "usb: cdnsp: Fix deadlock issue in cdnsp_thread_irq_handler",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47271",
    "datePublished": "2024-05-21T14:20:00.703Z",
    "dateReserved": "2024-05-21T13:27:52.127Z",
    "dateUpdated": "2026-05-11T13:51:16.818Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-7QVV-HM32-963P

CVE-2021-47271 (GCVE-0-2021-47271)

Tags

Sightings

Nomenclature