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Use of Insufficiently Random Values Affecting kernel-cross-headers package, versions <0:4.18.0-305.49.1.el8_4

Severity

 Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating

    Threat Intelligence

    EPSS
    0.49% (77th percentile)

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  • Snyk ID SNYK-RHEL8-KERNELCROSSHEADERS-4171545
  • published 19 Oct 2021
  • disclosed 26 Aug 2021
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Introduced: 26 Aug 2021

CVE-2021-20322 Open this link in a new tab
CWE-330 Open this link in a new tab

How to fix?

Upgrade RHEL:8 kernel-cross-headers to version 0:4.18.0-305.49.1.el8_4 or higher.
This issue was patched in RHSA-2022:4829.

NVD Description

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

A flaw in the processing of received ICMP errors (ICMP fragment needed and ICMP redirect) in the Linux kernel functionality was found to allow the ability to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypass the source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well.

References

CVSS Scores

version 3.1
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NVD

7.4 high
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    None
Expand this section

Red Hat

7.4 high
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SUSE

7.4 high