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CVE-2021-47241

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ethtool: strset: fix message length calculation Outer nest for ETHTOOL_A_STRSET_STRINGSETS is not accounted for.

Published May 21, 2024CWE-266EPSS 1.02%

Overview

CVE-2021-47241 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

ethtool: strset: fix message length calculation

Outer nest for ETHTOOL_A_STRSET_STRINGSETS is not accounted for.

This may result in ETHTOOL_MSG_STRSET_GET producing a warning like:

calculated message payload length (684) not sufficient

WARNING: CPU: 0 PID: 30967 at net/ethtool/netlink.c:369 ethnl_default_doit+0x87a/0xa20

and a splat.

As usually with such warnings three conditions must be met for the warning

to trigger:

- there must be no skb size rounding up (e.g. reply_size of 684);

- string set must be per-device (so that the header gets populated);

- the device name must be at least 12 characters long.

all in all with current user space it looks like reading priv flags

is the only place this could potentially happen. Or with syzbot :)

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/cfc7f0e70d649e6d2233fba0d9390b525677d971Refgit.kernel.org/stable/c/e175aef902697826d344ce3a12189329848fe898Refgit.kernel.org/stable/c/fb3a948143688e14e2cfd2a2812877923d0e5e92Refgit.kernel.org/stable/c/cfc7f0e70d649e6d2233fba0d9390b525677d971Refgit.kernel.org/stable/c/e175aef902697826d344ce3a12189329848fe898Refgit.kernel.org/stable/c/fb3a948143688e14e2cfd2a2812877923d0e5e92

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47241?

CVE-2021-47241 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-47241?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47241?

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-2021-47241?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47241 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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