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CVE-2026-98139

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ntfs: only count successfully cleared runs when freeing clusters ntfs_cluster_free_from_rl_nolock() adds a run's length to nr_f…

Published Sep 25, 2026linuxEPSS 0.13%

Overview

CVE-2026-98139 is a medium-severity vulnerability affecting linux linux_kernel. It was published on September 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

ntfs: only count successfully cleared runs when freeing clusters

ntfs_cluster_free_from_rl_nolock() adds a run's length to nr_freed

whenever the error bookkeeping condition is false, which includes

cases where ntfs_bitmap_clear_run() actually failed - e.g. a second

run failing with the same errno as an earlier one, or any failure

after a non-ENOMEM error was already recorded. Since a failed

ntfs_bitmap_clear_run() rolls back its partial modifications, no

bits were cleared for that run, yet its length still inflates

vol->free_clusters, corrupting statfs output and the allocator's

free space gate.

Only count runs whose bitmap clear succeeded.

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected products

VendorProductVersionsStatus
linuxlinux_kernel>= 7.1, < 7.2.7Affected

References

Refgit.kernel.org/stable/c/7eb97d8828e7758b9c81277f7802e740a800f78aRefgit.kernel.org/stable/c/be9e89ccb8e52a3e4b67feeb03ebd8133091dc7e

How CyberStrike helps

Frequently asked questions

What is CVE-2026-98139?

CVE-2026-98139 is a medium-severity vulnerability affecting linux linux_kernel. It was published on September 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-98139?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-98139?

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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-2026-98139?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98139 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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