CVE-2021-47454 Vulnerability Analysis & Exploit Details

CVE-2021-47454
Vulnerability Scoring

5.5
/10
Significant Risk

Security assessments indicate that CVE-2021-47454 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-2021-47454 Details

Status: Analyzed

Last updated: 🕟 29 Sep 2025, 16:48 UTC
Originally published on: 🕖 22 May 2024, 07:15 UTC

Time between publication and last update: 495 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-2021-47454 Vulnerability Summary

CVE-2021-47454: In the Linux kernel, the following vulnerability has been resolved: powerpc/smp: do not decrement idle task preempt count in CPU offline With PREEMPT_COUNT=y, when a CPU is offlined and then onlined again, we get: BUG: scheduling while atomic: swapper/1/0/0x00000000 no locks held by swapper/1/0. CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.15.0-rc2+ #100 Call Trace: dump_stack_lvl+0xac/0x108 __schedule_bug+0xac/0xe0 __schedule+0xcf8/0x10d0 schedule_idle+0x3c/0x70 do_idle+0x2d8/0x4a0 cpu_startup_entry+0x38/0x40 start_secondary+0x2ec/0x3a0 start_secondary_prolog+0x10/0x14 This is because powerpc's arch_cpu_idle_dead() decrements the idle task's preempt count, for reasons explained in commit a7c2bb8279d2 ("powerpc: Re-enable preemption before cpu_die()"), specifically "start_secondary() expects a preempt_count() of 0." However, since commit 2c669ef6979c ("powerpc/preempt: Don't touch the idle task's preempt_count during hotplug") and commit f1a0a376ca0c ("sched/core: Initialize the idle task with preemption disabled"), that justification no longer holds. The idle task isn't supposed to re-enable preemption, so remove the vestigial preempt_enable() from the CPU offline path. Tested with pseries and powernv in qemu, and pseries on PowerVM.

Assessing the Risk of CVE-2021-47454

Access Complexity Graph

The exploitability of CVE-2021-47454 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-2021-47454

CVE-2021-47454 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-2021-47454, 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-2021-47454, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2021-47454 has no significant impact on data confidentiality.
  • Integrity: None
    CVE-2021-47454 poses no threat to data integrity.
  • Availability: High
    CVE-2021-47454 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-2021-47454 References

External References

CWE Common Weakness Enumeration

NVD-CWE-noinfo

Vulnerable Configurations

  • cpe:2.3:o:linux:linux_kernel:5.10.50:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.50:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.51:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.51:*:*:*:*:*:*:*
  • 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:5.10.53:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.53:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.54:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.54:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.55:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.55:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.56:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.56:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.57:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.57:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.58:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.58:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.59:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.59:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.60:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.60:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.61:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.61:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.62:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.62:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.63:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.63:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.64:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.64:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.65:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.65:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.66:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.66:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.67:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.67:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.68:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.68:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.69:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.69:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.70:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.70:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.71:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.71:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.72:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.72:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.73:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.73:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.74:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.74:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.75:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.75:*:*:*:*:*:*:*
  • 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:5.12:rc8:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.12:rc8:*:*:*:*:*:*
  • 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:5.13.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.12:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.12:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.13:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.13:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.14:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.14:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.15:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.15:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.16:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.16:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.17:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.17:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.18:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.18:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13.19:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13.19:*:*:*:*:*:*:*
  • 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:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.13:rc7:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.13:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14.12:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14.12:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14.13:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14.13:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.14.14:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.14.14:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*

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