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CVE-2021-47564

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: marvell: prestera: fix double free issue on err path fix error path handling in prestera_bridge_port_join() that cases pre…

Published May 24, 2024CWE-415EPSS 0.21%

Overview

CVE-2021-47564 is a high-severity vulnerability. It was published on May 24, 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: marvell: prestera: fix double free issue on err path

fix error path handling in prestera_bridge_port_join() that

cases prestera driver to crash (see below).

Trace:

Internal error: Oops: 96000044 [#1] SMP

Modules linked in: prestera_pci prestera uio_pdrv_genirq

CPU: 1 PID: 881 Comm: ip Not tainted 5.15.0 #1

pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)

pc : prestera_bridge_destroy+0x2c/0xb0 [prestera]

lr : prestera_bridge_port_join+0x2cc/0x350 [prestera]

sp : ffff800011a1b0f0

...

x2 : ffff000109ca6c80 x1 : dead000000000100 x0 : dead000000000122

Call trace:

prestera_bridge_destroy+0x2c/0xb0 [prestera]

prestera_bridge_port_join+0x2cc/0x350 [prestera]

prestera_netdev_port_event.constprop.0+0x3c4/0x450 [prestera]

prestera_netdev_event_handler+0xf4/0x110 [prestera]

raw_notifier_call_chain+0x54/0x80

call_netdevice_notifiers_info+0x54/0xa0

__netdev_

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/03e5203d2161a00afe4d97d206d2293e40b2f253Refgit.kernel.org/stable/c/5dca8eff4627315df98feec09fff9dfe3356325eRefgit.kernel.org/stable/c/e8d032507cb7912baf1d3e0af54516f823befefdRefgit.kernel.org/stable/c/03e5203d2161a00afe4d97d206d2293e40b2f253Refgit.kernel.org/stable/c/5dca8eff4627315df98feec09fff9dfe3356325eRefgit.kernel.org/stable/c/e8d032507cb7912baf1d3e0af54516f823befefd

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47564?

CVE-2021-47564 is a high-severity vulnerability. It was published on May 24, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47564?

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-2021-47564?

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-2021-47564?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47564 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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