CVE-2021-47553 Vulnerability Analysis & Exploit Details

CVE-2021-47553
Vulnerability Scoring

7.8
/10
Very High Risk

Highly exploitable, CVE-2021-47553 poses a critical security risk that could lead to severe breaches.

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-2021-47553 Details

Status: Analyzed

Last updated: 🕒 18 Sep 2025, 15:11 UTC
Originally published on: 🕒 24 May 2024, 15:15 UTC

Time between publication and last update: 481 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:H/I:H/A:H

CVE-2021-47553 Vulnerability Summary

CVE-2021-47553: In the Linux kernel, the following vulnerability has been resolved: sched/scs: Reset task stack state in bringup_cpu() To hot unplug a CPU, the idle task on that CPU calls a few layers of C code before finally leaving the kernel. When KASAN is in use, poisoned shadow is left around for each of the active stack frames, and when shadow call stacks are in use. When shadow call stacks (SCS) are in use the task's saved SCS SP is left pointing at an arbitrary point within the task's shadow call stack. When a CPU is offlined than onlined back into the kernel, this stale state can adversely affect execution. Stale KASAN shadow can alias new stackframes and result in bogus KASAN warnings. A stale SCS SP is effectively a memory leak, and prevents a portion of the shadow call stack being used. Across a number of hotplug cycles the idle task's entire shadow call stack can become unusable. We previously fixed the KASAN issue in commit: e1b77c92981a5222 ("sched/kasan: remove stale KASAN poison after hotplug") ... by removing any stale KASAN stack poison immediately prior to onlining a CPU. Subsequently in commit: f1a0a376ca0c4ef1 ("sched/core: Initialize the idle task with preemption disabled") ... the refactoring left the KASAN and SCS cleanup in one-time idle thread initialization code rather than something invoked prior to each CPU being onlined, breaking both as above. We fixed SCS (but not KASAN) in commit: 63acd42c0d4942f7 ("sched/scs: Reset the shadow stack when idle_task_exit") ... but as this runs in the context of the idle task being offlined it's potentially fragile. To fix these consistently and more robustly, reset the SCS SP and KASAN shadow of a CPU's idle task immediately before we online that CPU in bringup_cpu(). This ensures the idle task always has a consistent state when it is running, and removes the need to so so when exiting an idle task. Whenever any thread is created, dup_task_struct() will give the task a stack which is free of KASAN shadow, and initialize the task's SCS SP, so there's no need to specially initialize either for idle thread within init_idle(), as this was only necessary to handle hotplug cycles. I've tested this on arm64 with: * gcc 11.1.0, defconfig +KASAN_INLINE, KASAN_STACK * clang 12.0.0, defconfig +KASAN_INLINE, KASAN_STACK, SHADOW_CALL_STACK ... offlining and onlining CPUS with: | while true; do | for C in /sys/devices/system/cpu/cpu*/online; do | echo 0 > $C; | echo 1 > $C; | done | done

Assessing the Risk of CVE-2021-47553

Access Complexity Graph

The exploitability of CVE-2021-47553 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-2021-47553

CVE-2021-47553 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-2021-47553, 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-2021-47553, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2021-47553 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2021-47553 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: High
    CVE-2021-47553 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-2021-47553 References

External References

CWE Common Weakness Enumeration

CWE-908

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:5.10.76:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.76:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.77:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.77:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.78:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.78:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.79:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.79:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.80:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.80:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.81:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.81:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.10.82:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.10.82:*:*:*:*:*:*:*
  • 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:*:*:*:*:*:*
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  • 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:5.13.2:*:*:*:*:*:*:*
    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:*:*:*:*:*:*:*
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  • 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:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14.4:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14.5:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14.6:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14.7:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14.8:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14.9:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14.13:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14.14:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14.16:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14.18:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14:rc3:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14:rc4:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14:rc5:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.14:rc6:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.15:-:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.15.0:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.15.0-58:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.15.1:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:5.15.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.3:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.3:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2021-47553: Combat Critical CVE Threats

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Other 5 Recently Published CVEs Vulnerabilities

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