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CVE-2021-47160

8.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: dsa: mt7530: fix VLAN traffic leaks PCR_MATRIX field was set to all 1's when VLAN filtering is enabled, but was not reset…

Published Mar 25, 2024EPSS 0.33%

Overview

CVE-2021-47160 is a high-severity vulnerability. It was published on March 25, 2024 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

net: dsa: mt7530: fix VLAN traffic leaks

PCR_MATRIX field was set to all 1's when VLAN filtering is enabled, but

was not reset when it is disabled, which may cause traffic leaks:

ip link add br0 type bridge vlan_filtering 1

ip link add br1 type bridge vlan_filtering 1

ip link set swp0 master br0

ip link set swp1 master br1

ip link set br0 type bridge vlan_filtering 0

ip link set br1 type bridge vlan_filtering 0

# traffic in br0 and br1 will start leaking to each other

As port_bridge_{add,del} have set up PCR_MATRIX properly, remove the

PCR_MATRIX write from mt7530_port_set_vlan_aware.

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/474a2ddaa192777522a7499784f1d60691cd831aRefgit.kernel.org/stable/c/4fe4e1f48ba119bdbc7c897c83b04ba0d08f5488Refgit.kernel.org/stable/c/82ae35b6c14feae5f216913d5b433e143c756d4eRefgit.kernel.org/stable/c/ae389812733b1b1e8e07fcc238e41db166b5c78dRefgit.kernel.org/stable/c/b91117b66fe875723a4e79ec6263526fffdb44d2Refgit.kernel.org/stable/c/474a2ddaa192777522a7499784f1d60691cd831aRefgit.kernel.org/stable/c/4fe4e1f48ba119bdbc7c897c83b04ba0d08f5488Refgit.kernel.org/stable/c/82ae35b6c14feae5f216913d5b433e143c756d4eRefgit.kernel.org/stable/c/ae389812733b1b1e8e07fcc238e41db166b5c78dRefgit.kernel.org/stable/c/b91117b66fe875723a4e79ec6263526fffdb44d2

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47160?

CVE-2021-47160 is a high-severity vulnerability. It was published on March 25, 2024 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2021-47160?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47160?

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-2021-47160?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47160 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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