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CVE-2021-47294

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netrom: Decrease sock refcount when sock timers expire Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use…

Published May 21, 2024CWE-672EPSS 0.28%

Overview

CVE-2021-47294 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:

netrom: Decrease sock refcount when sock timers expire

Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use

sock timer API. It replaces mod_timer() by sk_reset_timer(), and

del_timer() by sk_stop_timer().

Function sk_reset_timer() will increase the refcount of sock if it is

called on an inactive timer, hence, in case the timer expires, we need to

decrease the refcount ourselves in the handler, otherwise, the sock

refcount will be unbalanced and the sock will never be freed.

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/25df44e90ff5959b5c24ad361b648504a7e39ef3Refgit.kernel.org/stable/c/48866fd5c361ea417ed24b43fc2a7dc2f5b060efRefgit.kernel.org/stable/c/517a16b1a88bdb6b530f48d5d153478b2552d9a8Refgit.kernel.org/stable/c/6811744bd0efb9e472cb15d066cdb460beb8cb8aRefgit.kernel.org/stable/c/853262355518cd1247515b74e83fabf038aa6c29Refgit.kernel.org/stable/c/9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950Refgit.kernel.org/stable/c/a01634bf91f2b6c42583770eb6815fb6d1e251cfRefgit.kernel.org/stable/c/bc1660206c3723c37ed4d622ad81781f1e987250Refgit.kernel.org/stable/c/25df44e90ff5959b5c24ad361b648504a7e39ef3Refgit.kernel.org/stable/c/48866fd5c361ea417ed24b43fc2a7dc2f5b060ef

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47294?

CVE-2021-47294 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-2021-47294?

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-2021-47294?

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-2021-47294?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47294 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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