CVE-2021-47304 Vulnerability Analysis & Exploit Details

CVE-2021-47304
Vulnerability Scoring

5.5
/10
Significant Risk

Security assessments indicate that CVE-2021-47304 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-2021-47304 Details

Status: Analyzed

Last updated: 🕗 12 May 2025, 20:00 UTC
Originally published on: 🕒 21 May 2024, 15:15 UTC

Time between publication and last update: 356 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-2021-47304 Vulnerability Summary

CVE-2021-47304: In the Linux kernel, the following vulnerability has been resolved: tcp: fix tcp_init_transfer() to not reset icsk_ca_initialized This commit fixes a bug (found by syzkaller) that could cause spurious double-initializations for congestion control modules, which could cause memory leaks or other problems for congestion control modules (like CDG) that allocate memory in their init functions. The buggy scenario constructed by syzkaller was something like: (1) create a TCP socket (2) initiate a TFO connect via sendto() (3) while socket is in TCP_SYN_SENT, call setsockopt(TCP_CONGESTION), which calls: tcp_set_congestion_control() -> tcp_reinit_congestion_control() -> tcp_init_congestion_control() (4) receive ACK, connection is established, call tcp_init_transfer(), set icsk_ca_initialized=0 (without first calling cc->release()), call tcp_init_congestion_control() again. Note that in this sequence tcp_init_congestion_control() is called twice without a cc->release() call in between. Thus, for CC modules that allocate memory in their init() function, e.g, CDG, a memory leak may occur. The syzkaller tool managed to find a reproducer that triggered such a leak in CDG. The bug was introduced when that commit 8919a9b31eb4 ("tcp: Only init congestion control if not initialized already") introduced icsk_ca_initialized and set icsk_ca_initialized to 0 in tcp_init_transfer(), missing the possibility for a sequence like the one above, where a process could call setsockopt(TCP_CONGESTION) in state TCP_SYN_SENT (i.e. after the connect() or TFO open sendmsg()), which would call tcp_init_congestion_control(). It did not intend to reset any initialization that the user had already explicitly made; it just missed the possibility of that particular sequence (which syzkaller managed to find).

Assessing the Risk of CVE-2021-47304

Access Complexity Graph

The exploitability of CVE-2021-47304 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-2021-47304

CVE-2021-47304 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-2021-47304, 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-2021-47304, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2021-47304 has no significant impact on data confidentiality.
  • Integrity: None
    CVE-2021-47304 poses no threat to data integrity.
  • Availability: High
    CVE-2021-47304 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-2021-47304 References

External References

CWE Common Weakness Enumeration

CWE-415

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:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.26:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.27:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.28:*:*:*:*:*:*:*
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  • 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:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.31:*:*:*:*:*:*:*
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  • 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:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.44:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.45:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.46:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.47:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.47:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.48:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.49:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.50:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.51:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.10.52:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.52:*:*:*:*:*:*:*
  • 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:*:*:*:*:*:*:*
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  • 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:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11.8:*:*:*:*:*:*:*
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  • 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:*:*:*:*:*:*:*
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  • 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:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11.13:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11.14:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11.15:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11.16:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11.17:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11.18:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11.19:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11.21:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11.22:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11:rc1:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.11:rc4:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.12:-:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.12.1:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.12.5:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.12.6:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.12.7:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.12.8:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.12.9:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.12.10:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.12.11:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.12.12:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.12:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.13:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.13:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.14:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.14:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.15:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.15:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.16:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.16:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.17:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.17:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.18:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.18:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.19:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.19:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12.25:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12.25:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.12:rc7:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.0-52:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.0-52:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2021-47304: Combat Critical CVE Threats

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