In the Linux kernel, the following vulnerability has been resolved: ntfs: reject unprivileged writes to reserved $LX xattrs Reject setxattr of the… (CVE-2026-90132)
A vulnerability in the Linux kernel's NTFS implementation allowed unprivileged users to write to reserved extended attributes ($LXUID, $LXGID, $LXMOD, and $LXDEV). This issue has been resolved by rejecting such writes unless the caller has CAP_SYS_ADMIN privileges.
AI Analysis
Technical Summary
The Linux kernel had a vulnerability in its NTFS filesystem driver where unprivileged users could set extended attributes with reserved names ($LXUID, $LXGID, $LXMOD, $LXDEV) via the setxattr syscall. This could allow unauthorized modification of these attributes. The vulnerability is fixed by enforcing that only callers with CAP_SYS_ADMIN capability can perform these operations.
Potential Impact
An attacker with limited privileges could modify reserved NTFS extended attributes, potentially leading to unauthorized changes in file metadata. The CVSS score of 7.1 indicates a high severity with high impact on confidentiality and integrity, but no impact on availability.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to reject unprivileged writes to the reserved $LX* extended attributes unless the caller has CAP_SYS_ADMIN capability. Users should apply the official kernel updates that include this fix. No additional mitigation is required if the system is updated.
In the Linux kernel, the following vulnerability has been resolved: ntfs: reject unprivileged writes to reserved $LX xattrs Reject setxattr of the… (CVE-2026-90132)
Description
A vulnerability in the Linux kernel's NTFS implementation allowed unprivileged users to write to reserved extended attributes ($LXUID, $LXGID, $LXMOD, and $LXDEV). This issue has been resolved by rejecting such writes unless the caller has CAP_SYS_ADMIN privileges.
CVSS v3.1
Score 7.1high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel had a vulnerability in its NTFS filesystem driver where unprivileged users could set extended attributes with reserved names ($LXUID, $LXGID, $LXMOD, $LXDEV) via the setxattr syscall. This could allow unauthorized modification of these attributes. The vulnerability is fixed by enforcing that only callers with CAP_SYS_ADMIN capability can perform these operations.
Potential Impact
An attacker with limited privileges could modify reserved NTFS extended attributes, potentially leading to unauthorized changes in file metadata. The CVSS score of 7.1 indicates a high severity with high impact on confidentiality and integrity, but no impact on availability.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to reject unprivileged writes to the reserved $LX* extended attributes unless the caller has CAP_SYS_ADMIN capability. Users should apply the official kernel updates that include this fix. No additional mitigation is required if the system is updated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-fwfw-gmx6-hm94
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-90132"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6aade52655bf5e2cf5edc1ae
Added to database: 09/19/2026, 01:28:06 UTC
Last enriched: 09/19/2026, 01:53:03 UTC
Last updated: 09/19/2026, 02:41:27 UTC
Views: 2
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