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CVE-2023-0240

7.8 · HIGH

There is a logic error in io_uring's implementation which can be used to trigger a use-after-free vulnerability leading to privilege escalation.

Published Jan 30, 2023CWE-416EPSS 0.27%

Overview

CVE-2023-0240 is a high-severity vulnerability. It was published on January 30, 2023 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

There is a logic error in io_uring's implementation which can be used to trigger a use-after-free vulnerability leading to privilege escalation.

In the io_prep_async_work function the assumption that the last io_grab_identity call cannot return false is not true, and in this case the function will use the init_cred or the previous linked requests identity to do operations instead of using the current identity. This can lead to reference counting issues causing use-after-free. We recommend upgrading past version 5.10.161.

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/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring?h=linux-5.10.y&id=788d0824269bef539fe31a785b1517882eafed93GitHubgithub.com/gregkh/linux/commit/1e6fa5216a0e59ef02e8b6b40d553238a3b81d49Refkernel.dance/#788d0824269bef539fe31a785b1517882eafed93Refgit.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring?h=linux-5.10.y&id=788d0824269bef539fe31a785b1517882eafed93GitHubgithub.com/gregkh/linux/commit/1e6fa5216a0e59ef02e8b6b40d553238a3b81d49Refkernel.dance/#788d0824269bef539fe31a785b1517882eafed93Refsecurity.netapp.com/advisory/ntap-20230316-0001/

How CyberStrike helps

Frequently asked questions

What is CVE-2023-0240?

CVE-2023-0240 is a high-severity vulnerability. It was published on January 30, 2023 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-0240?

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-2023-0240?

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-2023-0240?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-0240 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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