Out-of-bounds Read Affecting kernel-uek-debug package, versions <0:5.4.17-2102.200.13.el7uek


Severity

Recommended
0.0
high
0
10

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.04% (11th percentile)

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  • Snyk IDSNYK-ORACLE7-KERNELUEKDEBUG-2598593
  • published10 Apr 2022
  • disclosed23 Mar 2021

Introduced: 23 Mar 2021

CVE-2021-3444  (opens in a new tab)
CWE-125  (opens in a new tab)
CWE-681  (opens in a new tab)
First added by Snyk

How to fix?

Upgrade Oracle:7 kernel-uek-debug to version 0:5.4.17-2102.200.13.el7uek or higher.
This issue was patched in ELSA-2021-9140.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-uek-debug package and not the kernel-uek-debug package as distributed by Oracle. See How to fix? for Oracle:7 relevant fixed versions and status.

The bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. This issue was addressed in the upstream kernel in commit 9b00f1b78809 ("bpf: Fix truncation handling for mod32 dst reg wrt zero") and in Linux stable kernels 5.11.2, 5.10.19, and 5.4.101.

CVSS Scores

version 3.1