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CVE-2018-1095

5.5 · MEDIUM

The ext4_xattr_check_entries function in fs/ext4/xattr.c in the Linux kernel through 4.15.15 does not properly validate xattr sizes, which causes misinterpretation of a size as an error code, and c…

Published Apr 2, 2018CWE-476EPSS 1.43%

Overview

CVE-2018-1095 is a medium-severity vulnerability. It was published on April 2, 2018 and has a CVSS 3.0 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

The ext4_xattr_check_entries function in fs/ext4/xattr.c in the Linux kernel through 4.15.15 does not properly validate xattr sizes, which causes misinterpretation of a size as an error code, and consequently allows attackers to cause a denial of service (get_acl NULL pointer dereference and system crash) via a crafted ext4 image.

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

Refopenwall.com/lists/oss-security/2018/03/29/1Refaccess.redhat.com/errata/RHSA-2018:2948Refbugzilla.kernel.org/show_bug.cgi?id=199185Refbugzilla.redhat.com/show_bug.cgi?id=1560793Refgit.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401Refusn.ubuntu.com/3695-1/Refusn.ubuntu.com/3695-2/Refopenwall.com/lists/oss-security/2018/03/29/1Refaccess.redhat.com/errata/RHSA-2018:2948Refbugzilla.kernel.org/show_bug.cgi?id=199185

How CyberStrike helps

Frequently asked questions

What is CVE-2018-1095?

CVE-2018-1095 is a medium-severity vulnerability. It was published on April 2, 2018 and has a CVSS 3.0 base score of 5.5 (MEDIUM).

How severe is CVE-2018-1095?

This vulnerability has a CVSS 3.0 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-1095?

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-2018-1095?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-1095 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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