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CVE-2022-49921

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: sched: Fix use after free in red_enqueue() We can't use "skb" again after passing it to qdisc_enqueue().

Published May 1, 2025CWE-416EPSS 0.19%

Overview

CVE-2022-49921 is a high-severity vulnerability. It was published on May 1, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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:

net: sched: Fix use after free in red_enqueue()

We can't use "skb" again after passing it to qdisc_enqueue(). This is

basically identical to commit 2f09707d0c97 ("sch_sfb: Also store skb

len before calling child enqueue").

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/170e5317042c302777ed6d59fdb84af9b0219d4eRefgit.kernel.org/stable/c/52e0429471976785c155bfbf51d80990c6cd46e2Refgit.kernel.org/stable/c/5960b9081baca85cc7dcb14aec1de85999ea9d36Refgit.kernel.org/stable/c/795afe0b9bb6c915f0299a8e309936519be01619Refgit.kernel.org/stable/c/8bdc2acd420c6f3dd1f1c78750ec989f02a1e2b9Refgit.kernel.org/stable/c/a238cdcf2bdc72207c74375fc8be13ee549ca9dbRefgit.kernel.org/stable/c/e877f8fa49fbccc63cb2df2e9179bddc695b825aRefgit.kernel.org/stable/c/fc4b50adb400ee5ec527a04073174e8e73a139fa

How CyberStrike helps

Frequently asked questions

What is CVE-2022-49921?

CVE-2022-49921 is a high-severity vulnerability. It was published on May 1, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-49921?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-49921?

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-2022-49921?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-49921 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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