<p>Upgrade <code>RHEL:8</code> <code>kernel-cross-headers</code> to version 0:4.18.0-348.el8 or higher.<br>This issue was patched in <code>RHSA-2021:4356</code>.</p>

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

Threat Intelligence

0.04% (6^th percentile)

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Snyk ID SNYK-RHEL8-KERNELCROSSHEADERS-4119519
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 RHEL:8 kernel-cross-headers to version 0:4.18.0-348.el8 or higher.
This issue was patched in RHSA-2021:4356.

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.

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

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

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

Severity

Based on Red Hat Enterprise Linux security rating