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CVE-2021-47175

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net/sched: fq_pie: fix OOB access in the traffic path the following script: # tc qdisc add dev eth0 handle 0x1 root fq_pie f…

Published Mar 25, 2024CWE-125EPSS 0.24%

Overview

CVE-2021-47175 is a high-severity vulnerability. It was published on March 25, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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:

net/sched: fq_pie: fix OOB access in the traffic path

the following script:

# tc qdisc add dev eth0 handle 0x1 root fq_pie flows 2

# tc qdisc add dev eth0 clsact

# tc filter add dev eth0 egress matchall action skbedit priority 0x10002

# ping 192.0.2.2 -I eth0 -c2 -w1 -q

produces the following splat:

BUG: KASAN: slab-out-of-bounds in fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie]

Read of size 4 at addr ffff888171306924 by task ping/942

CPU: 3 PID: 942 Comm: ping Not tainted 5.12.0+ #441

Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014

Call Trace:

dump_stack+0x92/0xc1

print_address_description.constprop.7+0x1a/0x150

kasan_report.cold.13+0x7f/0x111

fq_pie_qdisc_enqueue+0x1314/0x19d0 [sch_fq_pie]

__dev_queue_xmit+0x1034/0x2b10

ip_finish_output2+0xc62/0x2120

__ip_finish_output+0x553/0xea0

ip_output+0x1ca/0x4d0

ip_send_skb+0x37/0xa0

raw_sendmsg+0x1c4b/0

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/7a1bdec12e43e29cc34a4394590337069d8812ceRefgit.kernel.org/stable/c/e6294c06e7c62ffdd5bf3df696d3a4fcbb753d3cRefgit.kernel.org/stable/c/e70f7a11876a1a788ceadf75e9e5f7af2c868680Refgit.kernel.org/stable/c/7a1bdec12e43e29cc34a4394590337069d8812ceRefgit.kernel.org/stable/c/e6294c06e7c62ffdd5bf3df696d3a4fcbb753d3cRefgit.kernel.org/stable/c/e70f7a11876a1a788ceadf75e9e5f7af2c868680

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47175?

CVE-2021-47175 is a high-severity vulnerability. It was published on March 25, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47175?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47175?

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-2021-47175?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47175 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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