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CVE-2021-47295

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: sched: fix memory leak in tcindex_partial_destroy_work Syzbot reported memory leak in tcindex_set_parms().

Published May 21, 2024CWE-400EPSS 1.50%

Overview

CVE-2021-47295 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:

net: sched: fix memory leak in tcindex_partial_destroy_work

Syzbot reported memory leak in tcindex_set_parms(). The problem was in

non-freed perfect hash in tcindex_partial_destroy_work().

In tcindex_set_parms() new tcindex_data is allocated and some fields from

old one are copied to new one, but not the perfect hash. Since

tcindex_partial_destroy_work() is the destroy function for old

tcindex_data, we need to free perfect hash to avoid memory leak.

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/01d0d2b8b4e3cf2110baba9371c0c3d04ad5c77bRefgit.kernel.org/stable/c/18c3fa7a7fdbb4d21dafc8a7710ae2c1680930f6Refgit.kernel.org/stable/c/372ae77cf11d11fb118cbe2d37def9dd5f826abdRefgit.kernel.org/stable/c/3abebc503a5148072052c229c6b04b329a420ecdRefgit.kernel.org/stable/c/53af9c793f644d5841d84d8e0ad83bd7ab47f3e0Refgit.kernel.org/stable/c/7a6fb69bbcb21e9ce13bdf18c008c268874f0480Refgit.kernel.org/stable/c/7c183dc0af472dec33d2c0786a5e356baa8cad19Refgit.kernel.org/stable/c/8d7924ce85bae64e7a67c366c7c50840f49f3a62Refgit.kernel.org/stable/c/8e9662fde6d63c78eb1350f6167f64c9d71a865bRefgit.kernel.org/stable/c/cac71d27745f92ee13f0ecc668ffe151a4a9c9b1

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47295?

CVE-2021-47295 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-2021-47295?

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-2021-47295?

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-2021-47295?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47295 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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