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CVE-2026-23388

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: Squashfs: check metadata block offset is within range Syzkaller reports a "general protection fault in squashfs_copy_data" Thi…

Published Mar 25, 2026CWE-125EPSS 0.12%

Overview

CVE-2026-23388 is a high-severity vulnerability. It was published on March 25, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. 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:

Squashfs: check metadata block offset is within range

Syzkaller reports a "general protection fault in squashfs_copy_data"

This is ultimately caused by a corrupted index look-up table, which

produces a negative metadata block offset.

This is subsequently passed to squashfs_copy_data (via

squashfs_read_metadata) where the negative offset causes an out of bounds

access.

The fix is to check that the offset is within range in

squashfs_read_metadata. This will trap this and other cases.

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/01ee0bcc29864b78249308e8b35042b09bbf5fe3Refgit.kernel.org/stable/c/0c8ab092aec3ac4294940054772d30b511b16713Refgit.kernel.org/stable/c/3b9499e7d677dd4366239a292238489a804936b2Refgit.kernel.org/stable/c/3f68a9457a6190814377577374da75f872e0a013Refgit.kernel.org/stable/c/60f679f643f3f36a8571ea585e4ce5d93ef952b5Refgit.kernel.org/stable/c/6b847d65f5b0065e02080c61fad93d57d6686383Refgit.kernel.org/stable/c/9e9fa5ad37c9cbad73c165c7ff1e76e650825e7cRefgit.kernel.org/stable/c/fdb24a820a5832ec4532273282cbd4f22c291a0d

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23388?

CVE-2026-23388 is a high-severity vulnerability. It was published on March 25, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-23388?

This vulnerability has a CVSS 3.1 base score of 7.1, 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-2026-23388?

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-2026-23388?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23388 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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