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CVE-2023-2640

7.8 · HIGH

On Ubuntu kernels carrying both c914c0e27eb0 and "UBUNTU: SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs", an unprivileged user may set privileged extended attributes on…

Published Jul 26, 2023CWE-863EPSS 15.20%

Overview

CVE-2023-2640 is a high-severity vulnerability. It was published on July 26, 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

On Ubuntu kernels carrying both c914c0e27eb0 and "UBUNTU: SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs", an unprivileged user may set privileged extended attributes on the mounted files, leading them to be set on the upper files without the appropriate security checks.

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

Refcve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640Reflists.ubuntu.com/archives/kernel-team/2023-July/140923.htmlRefubuntu.com/security/notices/USN-6250-1Refwiz.io/blog/ubuntu-overlayfs-vulnerabilityRefcve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640Reflists.ubuntu.com/archives/kernel-team/2023-July/140923.htmlRefubuntu.com/security/notices/USN-6250-1Refwiz.io/blog/ubuntu-overlayfs-vulnerability

How CyberStrike helps

Frequently asked questions

What is CVE-2023-2640?

CVE-2023-2640 is a high-severity vulnerability. It was published on July 26, 2023 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-2640?

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-2023-2640?

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-2023-2640?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-2640 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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