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Out-of-bounds Read Affecting kernel-debug-devel package, versions <0:4.18.0-348.el8

Severity

 Recommended
medium

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.04% (6th percentile)

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  • Snyk ID SNYK-CENTOS8-KERNELDEBUGDEVEL-2138824
  • published 26 Jul 2021
  • disclosed 26 May 2021
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Introduced: 26 May 2021

CVE-2021-33200 Open this link in a new tab
CWE-125 Open this link in a new tab
CWE-787 Open this link in a new tab

How to fix?

Upgrade Centos:8 kernel-debug-devel to version 0:4.18.0-348.el8 or higher.

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 Centos. See How to fix? for Centos:8 relevant fixed versions and status.

kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect limits for pointer arithmetic operations, aka CID-bb01a1bba579. This can be abused to perform out-of-bounds reads and writes in kernel memory, leading to local privilege escalation to root. In particular, there is a corner case where the off reg causes a masking direction change, which then results in an incorrect final aux->alu_limit.

References

CVSS Scores

version 3.1
Expand this section

NVD

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

Red Hat

7.8 high
Expand this section

SUSE

8.4 high