CVE-2018-20856 (GCVE-0-2018-20856)

Vulnerability from cvelistv5 – Published: 2019-07-26 04:40 – Updated: 2024-08-05 12:12
VLAI
Summary
An issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c, there is an __blk_drain_queue() use-after-free because a certain error case is mishandled.
Severity
7.8 (High)
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • n/a
Assigner
References
URL Tags
https://cdn.kernel.org/pub/linux/kernel/v4.x/Chan… x_refsource_MISC
https://github.com/torvalds/linux/commit/54648cf1… x_refsource_MISC
https://git.kernel.org/cgit/linux/kernel/git/torv… x_refsource_MISC
https://usn.ubuntu.com/4094-1/ vendor-advisoryx_refsource_UBUNTU
https://seclists.org/bugtraq/2019/Aug/18 mailing-listx_refsource_BUGTRAQ
https://www.debian.org/security/2019/dsa-4497 vendor-advisoryx_refsource_DEBIAN
https://seclists.org/bugtraq/2019/Aug/26 mailing-listx_refsource_BUGTRAQ
https://lists.debian.org/debian-lts-announce/2019… mailing-listx_refsource_MLIST
http://packetstormsecurity.com/files/154059/Slack… x_refsource_MISC
https://usn.ubuntu.com/4116-1/ vendor-advisoryx_refsource_UBUNTU
https://usn.ubuntu.com/4118-1/ vendor-advisoryx_refsource_UBUNTU
https://security.netapp.com/advisory/ntap-2019090… x_refsource_CONFIRM
http://packetstormsecurity.com/files/154408/Kerne… x_refsource_MISC
https://support.f5.com/csp/article/K14673240?utm_… x_refsource_CONFIRM
https://access.redhat.com/errata/RHSA-2019:3076 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2019:3055 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2019:3089 vendor-advisoryx_refsource_REDHAT
http://packetstormsecurity.com/files/154951/Kerne… x_refsource_MISC
https://access.redhat.com/errata/RHSA-2019:3217 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2020:0100 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2020:0103 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2020:0543 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2020:0664 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2020:0698 vendor-advisoryx_refsource_REDHAT
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"An issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c, there is an __blk_drain_queue() use-after-free because a certain error case is mishandled.\"}, {\"lang\": \"es\", \"value\": \"El servidor web en ZENworks Configuration Management (ZCM) de Novell  versi\\u00f3n 10.3 y versi\\u00f3n 11.2 anteriores a 11.2.4, no realiza apropiadamente la autenticaci\\u00f3n para el archivo zenworks/jsp/index.jsp, lo que permite a los atacantes remotos realizar ataques de salto de directorio y en consecuencia cargar y ejecutar programas arbitrarios, por medio de una petici\\u00f3n al puerto TCP 443.\"}]",
      "id": "CVE-2018-20856",
      "lastModified": "2024-11-21T04:02:19.420",
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      "published": "2019-07-26T05:15:10.517",
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      "sourceIdentifier": "cve@mitre.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
    },
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-06-28T12:01:29+00:00",
      "cve": "CVE-2018-20856",
      "id": "CVE-2018-20856",
      "initial_release_date": "2018-01-01T00:00:00+00:00",
      "product_status:fixed": "602",
      "product_status:known_not_affected": "63",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Use-after-free in __blk_drain_queue() function in block/blk-core.c",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2018/cve-2018-20856.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-26T23:43:23Z",
      "cve": "CVE-2018-20856",
      "id": "CVE-2018-20856",
      "initial_release_date": "2023-02-15T04:20:44Z",
      "product_status:known_affected": "68",
      "product_status:known_not_affected": "382",
      "product_status:recommended": "216",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2018-20856",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2018-20856.json",
      "version": "20"
    }
  }
}



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Taxonomy of the tags.





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.