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CVE-2019-16233

Description

A flaw was found in the Linux kernel. A NULL pointer dereference flaw was found in the QLOGIC drivers for HBA. A call to alloc_workqueue return was not validated and can cause a denial of service. The highest threat from this vulnerability is to system availability.

Mitigation

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Common Vulnerability Scoring System (CVSS) Score Details

Info alert:Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

CVSS v3 Score Breakdown

Red HatNVDcve.org
Base Score4.14.1N/A
Attack VectorLocalLocalN/A
Attack ComplexityHighHighN/A
Privileges RequiredHighHighN/A
User InteractionNoneNoneN/A
ScopeUnchangedUnchangedN/A
ConfidentialityNoneNoneN/A
Integrity ImpactNoneNoneN/A
Availability ImpactHighHighN/A

Vector

Red Hat: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

NVD: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

Red Hat CVSS v3 Score Explanation

This flaw exploitation will need some per-conditions,

  • That is there should be a memory pressure in kernel space which will cause 'kzalloc' to fail and in turn 'alloc_workqueue' will fail , making 'AC:H'.

  • Attacker will have access to the shell and should have atleast a local account. 'AV:L'

  • Attacker should have an access privilege , a special user (or a root) to exploit , 'PR:H' to access HBA device.

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