Out-of-bounds write in Linux kernel - CVE-2026-72191

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Main Vulnerability Database Vulnerabilities #VU143403

Out-of-bounds write in Linux kernel - CVE-2026-72191

Published: August 16, 2026


Vulnerability identifier: #VU143403
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-72191
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds write in indx_insert_into_buffer in the ntfs3 filesystem code when processing a crafted NTFS filesystem image during file creation in a mounted directory. A local user can mount a specially crafted NTFS image and trigger filesystem operations to cause a denial of service.

Triggering the issue requires local mounting of an attacker-supplied filesystem image, such as via loopback, removable media, or USB, and a filesystem operation such as creating a file in the mounted directory.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-gcp (Ubuntu package)

How to mitigate CVE-2026-72191

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 7.0.0-34.34, 7.0.0-34.34.1, 7.0.0-34.34~24.04.1, 7.0.0-1012.12~24.04.1, 7.0.0-1013.13, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1020.20
linux-gcp (Ubuntu package) - addressed in versions 7.0.0-1013.13, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14

External References

Related Security Bulletins