CVE-2021-47272 Vulnerability Analysis & Exploit Details

CVE-2021-47272
Vulnerability Scoring

5.5
/10
Significant Risk

Security assessments indicate that CVE-2021-47272 presents a notable risk, potentially requiring prompt mitigation.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2021-47272 Details

Status: Analyzed

Last updated: 🕝 30 Apr 2025, 14:55 UTC
Originally published on: 🕒 21 May 2024, 15:15 UTC

Time between publication and last update: 343 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

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

CVE-2021-47272 Vulnerability Summary

CVE-2021-47272: In the Linux kernel, the following vulnerability has been resolved: usb: dwc3: gadget: Bail from dwc3_gadget_exit() if dwc->gadget is NULL There exists a possible scenario in which dwc3_gadget_init() can fail: during during host -> peripheral mode switch in dwc3_set_mode(), and a pending gadget driver fails to bind. Then, if the DRD undergoes another mode switch from peripheral->host the resulting dwc3_gadget_exit() will attempt to reference an invalid and dangling dwc->gadget pointer as well as call dma_free_coherent() on unmapped DMA pointers. The exact scenario can be reproduced as follows: - Start DWC3 in peripheral mode - Configure ConfigFS gadget with FunctionFS instance (or use g_ffs) - Run FunctionFS userspace application (open EPs, write descriptors, etc) - Bind gadget driver to DWC3's UDC - Switch DWC3 to host mode => dwc3_gadget_exit() is called. usb_del_gadget() will put the ConfigFS driver instance on the gadget_driver_pending_list - Stop FunctionFS application (closes the ep files) - Switch DWC3 to peripheral mode => dwc3_gadget_init() fails as usb_add_gadget() calls check_pending_gadget_drivers() and attempts to rebind the UDC to the ConfigFS gadget but fails with -19 (-ENODEV) because the FFS instance is not in FFS_ACTIVE state (userspace has not re-opened and written the descriptors yet, i.e. desc_ready!=0). - Switch DWC3 back to host mode => dwc3_gadget_exit() is called again, but this time dwc->gadget is invalid. Although it can be argued that userspace should take responsibility for ensuring that the FunctionFS application be ready prior to allowing the composite driver bind to the UDC, failure to do so should not result in a panic from the kernel driver. Fix this by setting dwc->gadget to NULL in the failure path of dwc3_gadget_init() and add a check to dwc3_gadget_exit() to bail out unless the gadget pointer is valid.

Assessing the Risk of CVE-2021-47272

Access Complexity Graph

The exploitability of CVE-2021-47272 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2021-47272

CVE-2021-47272 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2021-47272, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2021-47272, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2021-47272 has no significant impact on data confidentiality.
  • Integrity: None
    CVE-2021-47272 poses no threat to data integrity.
  • Availability: High
    CVE-2021-47272 can disrupt system operations, potentially causing complete denial of service (DoS).

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.045% (probability of exploit)

EPSS Percentile: 18.4% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 81.6% of others.

CVE-2021-47272 References

External References

CWE Common Weakness Enumeration

NVD-CWE-noinfo

Vulnerable Configurations

  • cpe:2.3:o:linux:linux_kernel:5.10:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.0:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.0:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.0:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.0:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.0:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.0:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.0:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.0:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.0:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.0:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.0:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.0:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.12:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.12:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.13:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.13:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.14:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.14:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.15:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.15:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.16:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.16:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.17:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.17:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.18:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.18:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.19:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.19:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.20:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.20:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.21:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.21:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.22:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.22:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.23:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.23:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.24:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.24:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.25:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.25:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.26:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.26:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.27:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.27:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.28:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.28:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.29:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.29:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.30:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.30:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.31:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.31:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.32:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.32:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.33:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.33:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.34:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.34:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.35:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.35:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.36:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.36:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.37:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.37:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.38:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.38:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.39:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.39:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.40:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.40:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.41:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.41:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.42:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.42:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.43:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.43:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.12:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.12:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.13:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.13:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.14:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.14:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.15:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.15:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.16:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.16:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.17:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.17:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.18:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.18:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.19:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.19:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.20:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.20:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.21:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.21:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11.22:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11.22:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.11:rc7:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.11:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*

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