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CVE-2018-20784 (GCVE-0-2018-20784)

Vulnerability from cvelistv5 – Published: 2019-02-22 15:00 – Updated: 2024-08-05 12:12
VLAI
Summary
In the Linux kernel before 4.20.2, kernel/sched/fair.c mishandles leaf cfs_rq's, which allows attackers to cause a denial of service (infinite loop in update_blocked_averages) or possibly have unspecified other impact by inducing a high load.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • n/a
Assigner
References
URL Tags
https://github.com/torvalds/linux/commit/c40f7d74… x_refsource_MISC
http://git.kernel.org/cgit/linux/kernel/git/torva… x_refsource_MISC
https://cdn.kernel.org/pub/linux/kernel/v4.x/Chan… x_refsource_MISC
https://access.redhat.com/errata/RHSA-2019:1959 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2019:1971 vendor-advisoryx_refsource_REDHAT
https://usn.ubuntu.com/4115-1/ vendor-advisoryx_refsource_UBUNTU
https://usn.ubuntu.com/4118-1/ vendor-advisoryx_refsource_UBUNTU
https://usn.ubuntu.com/4211-2/ vendor-advisoryx_refsource_UBUNTU
https://usn.ubuntu.com/4211-1/ vendor-advisoryx_refsource_UBUNTU
Date Public
2019-02-22 00:00
Show details on NVD website
To clipboard 

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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T06:53:39+00:00",
      "cve": "CVE-2018-20784",
      "id": "CVE-2018-20784",
      "initial_release_date": "2018-12-28T00:00:00+00:00",
      "product_status:fixed": "154",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "55",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: infinite loop in update_blocked_averages() in kernel/sched/fair.c leading to denial of service",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2018/cve-2018-20784.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-01T23:34:09Z",
      "cve": "CVE-2018-20784",
      "id": "CVE-2018-20784",
      "initial_release_date": "2023-02-15T04:20:51Z",
      "product_status:known_not_affected": "491",
      "product_status:recommended": "137",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2018-20784",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2018-20784.json",
      "version": "20"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.