Linux Kernel up to 7.2.5 NTFS setxattr LXUID/LXGID/LXMOD/LXDEV privileges management

Summaryinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.2.5. This impacts the function setxattr of the component NTFS. This manipulation of the argument LXUID/LXGID/LXMOD/LXDEV causes privileges management. This vulnerability is tracked as CVE-2026-90132. The attack is restricted to local execution. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical was found in Linux Kernel up to 7.2.5. Affected by this vulnerability is the function setxattr of the component NTFS. The manipulation of the argument LXUID/LXGID/LXMOD/LXDEV with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ntfs: reject unprivileged writes to reserved $LX* xattrs Reject setxattr of the reserved $LXUID, $LXGID, $LXMOD and $LXDEV names from userspace unless the caller has CAP_SYS_ADMIN.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-90132 since 09/11/2026. The exploitation appears to be easy. An attack has to be approached locally. Additional levels of successful authentication are required for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/17/2026). MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 86f46508016bc1f2bffb3a52dc2664f942fb9802/ea6a67ef64451d2da298f15baa35865b4bb6372a is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.5

License

• open-source

Website

• Vendor: https://www.kernel.org/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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