Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2021-47240

8.4 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: qrtr: fix OOB Read in qrtr_endpoint_post Syzbot reported slab-out-of-bounds Read in qrtr_endpoint_post.

Published May 21, 2024CWE-125EPSS 0.24%

Overview

CVE-2021-47240 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 8.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.4, 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: qrtr: fix OOB Read in qrtr_endpoint_post

Syzbot reported slab-out-of-bounds Read in

qrtr_endpoint_post. The problem was in wrong

_size_ type:

if (len != ALIGN(size, 4) + hdrlen)

goto err;

If size from qrtr_hdr is 4294967293 (0xfffffffd), the result of

ALIGN(size, 4) will be 0. In case of len == hdrlen and size == 4294967293

in header this check won't fail and

skb_put_data(skb, data + hdrlen, size);

will read out of bound from data, which is hdrlen allocated block.

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/19892ab9c9d838e2e5a7744d36e4bb8b7c3292feRefgit.kernel.org/stable/c/26b8d10703a9be45d6097946b2b4011f7dd2c56fRefgit.kernel.org/stable/c/960b08dd36de1e341e3eb43d1c547513e338f4f8Refgit.kernel.org/stable/c/ad9d24c9429e2159d1e279dc3a83191ccb4daf1dRefgit.kernel.org/stable/c/f8111c0d7ed42ede41a3d0d393b104de0730a8a6Refgit.kernel.org/stable/c/19892ab9c9d838e2e5a7744d36e4bb8b7c3292feRefgit.kernel.org/stable/c/26b8d10703a9be45d6097946b2b4011f7dd2c56fRefgit.kernel.org/stable/c/960b08dd36de1e341e3eb43d1c547513e338f4f8Refgit.kernel.org/stable/c/ad9d24c9429e2159d1e279dc3a83191ccb4daf1dRefgit.kernel.org/stable/c/f8111c0d7ed42ede41a3d0d393b104de0730a8a6

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47240?

CVE-2021-47240 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 8.4 (HIGH).

How severe is CVE-2021-47240?

This vulnerability has a CVSS 3.1 base score of 8.4, 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-2021-47240?

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-2021-47240?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47240 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.

Related HIGH CVEs from 2021

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999