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Use After Free Affecting kernel-debug-devel package, versions <0:4.18.0-305.el8

Severity

 Recommended
high

Based on Red Hat Enterprise Linux security rating

    Threat Intelligence

    EPSS
    0.06% (25th percentile)

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  • Snyk ID SNYK-RHEL8-KERNELDEBUGDEVEL-3990498
  • published 1 Aug 2022
  • disclosed 21 Mar 2020
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Introduced: 21 Mar 2020

CVE-2020-36557 Open this link in a new tab
CWE-416 Open this link in a new tab

How to fix?

Upgrade RHEL:8 kernel-debug-devel to version 0:4.18.0-305.el8 or higher.
This issue was patched in RHSA-2021:1578.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-debug-devel package and not the kernel-debug-devel package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

A race condition in the Linux kernel before 5.6.2 between the VT_DISALLOCATE ioctl and closing/opening of ttys could lead to a use-after-free.

CVSS Scores

version 3.1
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NVD

5.1 medium
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    None
  • Availability (A)
    High
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Red Hat

5.1 medium
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SUSE

7.8 high