{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs/ea.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "86f46508016bc1f2bffb3a52dc2664f942fb9802",
              "status": "affected",
              "version": "fc053f05ca282a5e760b41f6560ac835c4e28037",
              "versionType": "git"
            },
            {
              "lessThan": "ea6a67ef64451d2da298f15baa35865b4bb6372a",
              "status": "affected",
              "version": "fc053f05ca282a5e760b41f6560ac835c4e28037",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs/ea.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": "2026-10-19T08:58:30.496Z",
        "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",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90132",
    "datePublished": "2026-09-17T16:06:32.576Z",
    "dateReserved": "2026-09-11T19:38:34.788Z",
    "dateUpdated": "2026-10-19T08:58:30.496Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}