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CVE-2026-72186

9.1 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: ntfs: make system files immutable to prevent corruption When a system file such as $Bitmap is exposed via show_sys_files and wr…

Published Aug 15, 2026EPSS 0.50%

Overview

CVE-2026-72186 is a critical-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ntfs: make system files immutable to prevent corruption

When a system file such as $Bitmap is exposed via show_sys_files and

written from userspace, the volume is corrupted and, because the cluster

allocator scans $Bitmap through the same inode's page cache, a write to

$Bitmap also deadlocks writeback against the folio it already holds locked.

These files are maintained by the driver itself and have no valid reason

to be written through the file interface. Mark base metadata files

(mft_no < FILE_first_user) as immutable during inode read so the VFS

rejects write, mmap, truncate and unlink with -EPERM. Directories are

skipped so the root and $Extend remain usable. Internal metadata updates

do not go through the VFS write path and are unaffected.

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/8f313e92522ac41d273ea137db13ea8a8df2beedRefgit.kernel.org/stable/c/f72df3a4c33b64de3418ec74d1ad4f028e09d161

How CyberStrike helps

Frequently asked questions

What is CVE-2026-72186?

CVE-2026-72186 is a critical-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-72186?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-72186?

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-2026-72186?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-72186 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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