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CVE-2022-49873

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix wrong reg type conversion in release_reference() Some helper functions will allocate memory.

Published May 1, 2025CWE-704EPSS 0.21%

Overview

CVE-2022-49873 is a medium-severity vulnerability. It was published on May 1, 2025 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:

bpf: Fix wrong reg type conversion in release_reference()

Some helper functions will allocate memory. To avoid memory leaks, the

verifier requires the eBPF program to release these memories by calling

the corresponding helper functions.

When a resource is released, all pointer registers corresponding to the

resource should be invalidated. The verifier use release_references() to

do this job, by apply __mark_reg_unknown() to each relevant register.

It will give these registers the type of SCALAR_VALUE. A register that

will contain a pointer value at runtime, but of type SCALAR_VALUE, which

may allow the unprivileged user to get a kernel pointer by storing this

register into a map.

Using __mark_reg_not_init() while NOT allow_ptr_leaks can mitigate this

problem.

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/466ce46f251dfb259a8cbaa895ab9edd6fb56240Refgit.kernel.org/stable/c/ae5ccad6c711db0f2ca1231be051935dd128b8f5Refgit.kernel.org/stable/c/cedd4f01f67be94735f15123158f485028571037Refgit.kernel.org/stable/c/f1db20814af532f85e091231223e5e4818e8464b

How CyberStrike helps

Frequently asked questions

What is CVE-2022-49873?

CVE-2022-49873 is a medium-severity vulnerability. It was published on May 1, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49873?

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-2022-49873?

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-2022-49873?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-49873 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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