CVE-2026-90132 (GCVE-0-2026-90132)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:06 – Updated: 2026-09-18 17:53
VLAI
Title
ntfs: reject unprivileged writes to reserved $LX* xattrs
Summary
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.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fc053f05ca282a5e760b41f6560ac835c4e28037 , < 86f46508016bc1f2bffb3a52dc2664f942fb9802 (git)
Affected: fc053f05ca282a5e760b41f6560ac835c4e28037 , < ea6a67ef64451d2da298f15baa35865b4bb6372a (git)
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Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs/ea.c"
          ],
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          "vendor": "Linux",
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              "version": "fc053f05ca282a5e760b41f6560ac835c4e28037",
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          "vendor": "Linux",
          "versions": [
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              "version": "7.1"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.3-rc1",
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: reject unprivileged writes to reserved $LX* xattrs\n\nReject setxattr of the reserved $LXUID, $LXGID, $LXMOD and $LXDEV names\nfrom userspace unless the caller has CAP_SYS_ADMIN."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The attacker-controlled $LXUID/$LXGID/$LXMOD/$LXDEV name and 4-byte value enter via setxattr/fsetxattr/lsetxattr into ntfs_setxattr(); ksmbd SMB2 SET_INFO and nfsd4_decode_xattr_name both prefix user., so those paths cannot store the unprefixed EAs that ntfs_ea_get_wsl_inode() loads.\nAC:L - ntfs_setxattr() persists the EAs through ntfs_set_ea() without changing live i_uid/i_mode; the attacker then drops refs and forces icache reclaim so ntfs_read_locked_inode() runs ntfs_ea_get_wsl_inode() and applies the planted uid and S_ISUID mode. No uninfluenced race is required.\nPR:L - xattr_permission() only requires inode_permission(MAY_WRITE) for these unprefixed names, and pre-fix ntfs_setxattr() had no capable() check. Default ntfs mounts leave vol-\u003euid INVALID_UID (so $LXUID is applied) and files mode 0777, so any unprivileged writer can set the EAs.\nUI:N - The attacker issues setxattr on a file they can already write on an ntfs volume that is already mounted; no other user must insert media, mount an image, or open the planted file.\nS:U - ntfs_ea_get_wsl_inode() copies planted $LXUID/$LXMOD into the host inode\u0027s i_uid and i_mode. That is local privilege escalation inside the same kernel authority, not a VM, IOMMU, or sandbox escape.\nC:H - On reload, ntfs_ea_get_wsl_inode() does i_uid_write() from $LXUID and assigns inode-\u003ei_mode from $LXMOD; planting uid 0 and S_ISUID on an executable the attacker wrote yields euid 0 and full disclosure of host files.\nI:H - The same $LXUID/$LXMOD plant lets the attacker execute their own binary as root after ntfs_read_locked_inode() reloads the inode, giving unrestricted modification of host data. The bug is an unauthorized write of kernel-trusted WSL permission EAs.\nA:N - ntfs_set_ea() of $LXUID/$LXGID/$LXMOD/$LXDEV only stores NTFS extended attributes, and ntfs_ea_get_wsl_inode() only assigns i_uid, i_gid, i_mode, and rdev. That path has no kernel crash, hang, UAF, or BUG_ON."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T17:53:13.727Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/86f46508016bc1f2bffb3a52dc2664f942fb9802"
        },
        {
          "url": "https://git.kernel.org/stable/c/ea6a67ef64451d2da298f15baa35865b4bb6372a"
        }
      ],
      "title": "ntfs: reject unprivileged writes to reserved $LX* xattrs",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90132",
    "datePublished": "2026-09-17T16:06:32.576Z",
    "dateReserved": "2026-09-11T19:38:34.788Z",
    "dateUpdated": "2026-09-18T17:53:13.727Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-25",
      "epss": "0.00163",
      "percentile": "0.04852"
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                "product": "Linux",
                "programFiles": [
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: reject unprivileged writes to reserved $LX* xattrs\n\nReject setxattr of the reserved $LXUID, $LXGID, $LXMOD and $LXDEV names\nfrom userspace unless the caller has CAP_SYS_ADMIN."
          }
        ],
        "id": "CVE-2026-90132",
        "lastModified": "2026-09-18T18:17:43.013",
        "metrics": {
          "cvssMetricV31": [
            {
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                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "NONE",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
                "version": "3.1"
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              "impactScore": 5.2,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-09-17T17:17:05.733",
        "references": [
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        "vulnStatus": "Received"
      }
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    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-21T16:32:39Z",
      "cve": "CVE-2026-90132",
      "id": "CVE-2026-90132",
      "initial_release_date": "2026-09-18T00:20:57Z",
      "product_status:known_not_affected": "347",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90132",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-90132.json",
      "version": "4"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

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