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CVE-2021-47353

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: udf: Fix NULL pointer dereference in udf_symlink function In function udf_symlink, epos.bh is assigned with the value returned…

Published May 21, 2024CWE-476EPSS 0.31%

Overview

CVE-2021-47353 is a medium-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

udf: Fix NULL pointer dereference in udf_symlink function

In function udf_symlink, epos.bh is assigned with the value returned

by udf_tgetblk. The function udf_tgetblk is defined in udf/misc.c

and returns the value of sb_getblk function that could be NULL.

Then, epos.bh is used without any check, causing a possible

NULL pointer dereference when sb_getblk fails.

This fix adds a check to validate the value of epos.bh.

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/21bf1414580c36ffc8d8de043beb3508cf812238Refgit.kernel.org/stable/c/2f3d9ddd32a28803baa547e6274983b67d5e287cRefgit.kernel.org/stable/c/3638705ecd5ad2785e996f820121c0ad15ce64b5Refgit.kernel.org/stable/c/371566f63cbd0bb6fbb25b8fe9d5798268d35af9Refgit.kernel.org/stable/c/5150877e4d99f85057a458daac7cd7c01005d5c6Refgit.kernel.org/stable/c/80d505aee6398cf8beb72475c7edcf1733c1c68bRefgit.kernel.org/stable/c/aebed6b19e51a34003d998da5ebb1dfdd2cb1d02Refgit.kernel.org/stable/c/baea588a42d675e35daeaddd10fbc9700550bc4dRefgit.kernel.org/stable/c/fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43Refgit.kernel.org/stable/c/21bf1414580c36ffc8d8de043beb3508cf812238

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47353?

CVE-2021-47353 is a medium-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47353?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47353?

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-2021-47353?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47353 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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