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CVE-2022-48809

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net: fix a memleak when uncloning an skb dst and its metadata When uncloning an skb dst and its associated metadata, a new dst+…

Published Jul 16, 2024CWE-401EPSS 0.28%

Overview

CVE-2022-48809 is a medium-severity vulnerability. It was published on July 16, 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:

net: fix a memleak when uncloning an skb dst and its metadata

When uncloning an skb dst and its associated metadata, a new

dst+metadata is allocated and later replaces the old one in the skb.

This is helpful to have a non-shared dst+metadata attached to a specific

skb.

The issue is the uncloned dst+metadata is initialized with a refcount of

1, which is increased to 2 before attaching it to the skb. When

tun_dst_unclone returns, the dst+metadata is only referenced from a

single place (the skb) while its refcount is 2. Its refcount will never

drop to 0 (when the skb is consumed), leading to a memory leak.

Fix this by removing the call to dst_hold in tun_dst_unclone, as the

dst+metadata refcount is already 1.

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/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1Refgit.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10aRefgit.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4Refgit.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108Refgit.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613Refgit.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88Refgit.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540Refgit.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314Refgit.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1Refgit.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a

How CyberStrike helps

Frequently asked questions

What is CVE-2022-48809?

CVE-2022-48809 is a medium-severity vulnerability. It was published on July 16, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-48809?

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-2022-48809?

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-2022-48809?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-48809 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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