Out-of-bounds write in Linux kernel - CVE-2026-90048

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Main Vulnerability Database Vulnerabilities #VU150238

Out-of-bounds write in Linux kernel - CVE-2026-90048

Published: September 16, 2026


Vulnerability identifier: #VU150238
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90048
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to compromise confidentiality, integrity, and availability.

The vulnerability exists due to an out-of-bounds write in ni_create_attr_list() in the NTFS3 filesystem driver when processing a crafted loop-mounted NTFS image. A remote attacker can craft an NTFS image containing many nameless minimum-size resident attributes to compromise confidentiality, integrity, and availability.

Exploitation is reached by opening a file on the mounted image and adding an attribute.


Affected software

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

How to mitigate CVE-2026-90048

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.111-1

External References

Related Security Bulletins