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CVE-2024-49936

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net/xen-netback: prevent UAF in xenvif_flush_hash() During the list_for_each_entry_rcu iteration call of xenvif_flush_hash, kfr…

Published Oct 21, 2024CWE-416EPSS 0.27%

Overview

CVE-2024-49936 is a high-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, 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/xen-netback: prevent UAF in xenvif_flush_hash()

During the list_for_each_entry_rcu iteration call of xenvif_flush_hash,

kfree_rcu does not exist inside the rcu read critical section, so if

kfree_rcu is called when the rcu grace period ends during the iteration,

UAF occurs when accessing head->next after the entry becomes free.

Therefore, to solve this, you need to change it to list_for_each_entry_safe.

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/0fa5e94a1811d68fbffa0725efe6d4ca62c03d12Refgit.kernel.org/stable/c/143edf098b80669d05245b2f2367dd156a83a2c5Refgit.kernel.org/stable/c/3c4423b0c4b98213b3438e15061e1d08220e6982Refgit.kernel.org/stable/c/54d8639af5568fc41c0e274fc3ec9cf86c59fcbbRefgit.kernel.org/stable/c/a0465723b8581cad27164c9073fd780904cd22d4Refgit.kernel.org/stable/c/a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22cRefgit.kernel.org/stable/c/d408889d4b54f5501e4becc4dbbb9065143fbf4eRefgit.kernel.org/stable/c/efcff6ce7467f01f0753609f420333f3f2cecedaReflists.debian.org/debian-lts-announce/2025/01/msg00001.htmlReflists.debian.org/debian-lts-announce/2025/03/msg00002.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-49936?

CVE-2024-49936 is a high-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2024-49936?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2024-49936?

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-2024-49936?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-49936 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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