Homepage
About Snyk

Out-of-bounds Read Affecting kernel-rt-trace-devel package, versions *

Severity

medium

    Threat Intelligence

    EPSS
    0.04% (6th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk ID SNYK-CENTOS7-KERNELRTTRACEDEVEL-2020777
  • published 26 Jul 2021
  • disclosed 26 May 2021
Report a new vulnerability Found a mistake?

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?

There is no fixed version for Centos:7 kernel-rt-trace-devel.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-trace-devel package and not the kernel-rt-trace-devel package as distributed by Centos. See How to fix? for Centos:7 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

Snyk

7.8 medium
  • 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

NVD

7.8 high
Expand this section

SUSE

8.4 high
Expand this section

Red Hat

7.8 high