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CVE-2021-47100

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ipmi: Fix UAF when uninstall ipmi_si and ipmi_msghandler module Hi, When testing install and uninstall of ipmi_si.ko and ipmi_…

Published Mar 4, 2024CWE-416EPSS 0.24%

Overview

CVE-2021-47100 is a medium-severity vulnerability. It was published on March 4, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ipmi: Fix UAF when uninstall ipmi_si and ipmi_msghandler module

Hi,

When testing install and uninstall of ipmi_si.ko and ipmi_msghandler.ko,

the system crashed.

The log as follows:

[ 141.087026] BUG: unable to handle kernel paging request at ffffffffc09b3a5a

[ 141.087241] PGD 8fe4c0d067 P4D 8fe4c0d067 PUD 8fe4c0f067 PMD 103ad89067 PTE 0

[ 141.087464] Oops: 0010 [#1] SMP NOPTI

[ 141.087580] CPU: 67 PID: 668 Comm: kworker/67:1 Kdump: loaded Not tainted 4.18.0.x86_64 #47

[ 141.088009] Workqueue: events 0xffffffffc09b3a40

[ 141.088009] RIP: 0010:0xffffffffc09b3a5a

[ 141.088009] Code: Bad RIP value.

[ 141.088009] RSP: 0018:ffffb9094e2c3e88 EFLAGS: 00010246

[ 141.088009] RAX: 0000000000000000 RBX: ffff9abfdb1f04a0 RCX: 0000000000000000

[ 141.088009] RDX: 0000000000000000 RSI: 0000000000000246 RDI: 0000000000000246

[ 141.088009] RBP: 0000000000000000 R08: ffff9abfffee3cb8 R09: 00000000000002e1

[ 141.088009] R1

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/6809da5185141e61401da5b01896b79a4deed1adRefgit.kernel.org/stable/c/6b3f7e4b10f343f05b5fb513b07a9168fbf1172eRefgit.kernel.org/stable/c/925229d552724e1bba1abf01d3a0b1318539b012Refgit.kernel.org/stable/c/992649b8b16843d27eb39ceea5f9cf85ffb50a18Refgit.kernel.org/stable/c/ffb76a86f8096a8206be03b14adda6092e18e275Refgit.kernel.org/stable/c/6809da5185141e61401da5b01896b79a4deed1adRefgit.kernel.org/stable/c/6b3f7e4b10f343f05b5fb513b07a9168fbf1172eRefgit.kernel.org/stable/c/925229d552724e1bba1abf01d3a0b1318539b012Refgit.kernel.org/stable/c/992649b8b16843d27eb39ceea5f9cf85ffb50a18Refgit.kernel.org/stable/c/ffb76a86f8096a8206be03b14adda6092e18e275

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47100?

CVE-2021-47100 is a medium-severity vulnerability. It was published on March 4, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47100?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47100?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47100?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47100 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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