{"api_version":"1","generated_at":"2026-07-24T17:40:00+00:00","cve":"CVE-2026-63833","urls":{"html":"https://cve.report/CVE-2026-63833","api":"https://cve.report/api/cve/CVE-2026-63833.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63833","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63833"},"summary":{"title":"ntfs3: reject direct userspace writes to reserved $LX* xattrs","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: reject direct userspace writes to reserved $LX* xattrs\n\nNTFS3 uses $LXUID, $LXGID, $LXMOD and $LXDEV as internal WSL\npermission metadata and reloads them into i_uid, i_gid and i_mode\nfrom ntfs_get_wsl_perm().\n\nBecause the empty-prefix xattr handler also lets file owners call\nsetxattr() on these names directly, an unprivileged writer on a\nwritable ntfs3 mount can plant root ownership and S_ISUID on their own\nfile and gain euid 0 after inode reload.\n\nReject direct userspace writes to the reserved $LX* names. Internal\nntfs3 metadata updates are unchanged because ntfs_save_wsl_perm()\nwrites them via ntfs_set_ea() directly.\n\n[almaz.alexandrovich@paragon-software.com: added an additional check for non privileged users]","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 12:16:56","updated_at":"2026-07-20 15:16:50"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","data":{"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"}}],"references":[{"url":"https://git.kernel.org/stable/c/f8d420949b335a4b51d06ab276beee6b8dfdc909","name":"https://git.kernel.org/stable/c/f8d420949b335a4b51d06ab276beee6b8dfdc909","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/293a84fa40b3a1b3471c0545722724bc10973f76","name":"https://git.kernel.org/stable/c/293a84fa40b3a1b3471c0545722724bc10973f76","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5b08dccecf825cbf905f348bc6ccb497507e28e2","name":"https://git.kernel.org/stable/c/5b08dccecf825cbf905f348bc6ccb497507e28e2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5e658b9245a52d838ef93729a7bc07de8e19deb7","name":"https://git.kernel.org/stable/c/5e658b9245a52d838ef93729a7bc07de8e19deb7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e574af95234afc3c725988bbc1fdeb46b9f386a4","name":"https://git.kernel.org/stable/c/e574af95234afc3c725988bbc1fdeb46b9f386a4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2c3cd6da4a14380ef79e34bd9dff7caf46687477","name":"https://git.kernel.org/stable/c/2c3cd6da4a14380ef79e34bd9dff7caf46687477","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e8852ae29868e449fdb47eebc28f35fb80741a5f","name":"https://git.kernel.org/stable/c/e8852ae29868e449fdb47eebc28f35fb80741a5f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63833","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63833","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected be71b5cba2e6485e8959da7a9f9a44461a1bb074 e574af95234afc3c725988bbc1fdeb46b9f386a4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected be71b5cba2e6485e8959da7a9f9a44461a1bb074 2c3cd6da4a14380ef79e34bd9dff7caf46687477 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected be71b5cba2e6485e8959da7a9f9a44461a1bb074 e8852ae29868e449fdb47eebc28f35fb80741a5f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected be71b5cba2e6485e8959da7a9f9a44461a1bb074 f8d420949b335a4b51d06ab276beee6b8dfdc909 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: reject direct userspace writes to reserved $LX* xattrs\n\nNTFS3 uses $LXUID, $LXGID, $LXMOD and $LXDEV as internal WSL\npermission metadata and reloads them into i_uid, i_gid and i_mode\nfrom ntfs_get_wsl_perm().\n\nBecause the empty-prefix xattr handler also lets file owners call\nsetxattr() on these names directly, an unprivileged writer on a\nwritable ntfs3 mount can plant root ownership and S_ISUID on their own\nfile and gain euid 0 after inode reload.\n\nReject direct userspace writes to the reserved $LX* names. Internal\nntfs3 metadata updates are unchanged because ntfs_save_wsl_perm()\nwrites them via ntfs_set_ea() directly.\n\n[almaz.alexandrovich@paragon-software.com: added an additional check for non privileged users]"}],"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"}}],"providerMetadata":{"dateUpdated":"2026-07-20T13:40:36.626Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e574af95234afc3c725988bbc1fdeb46b9f386a4"},{"url":"https://git.kernel.org/stable/c/2c3cd6da4a14380ef79e34bd9dff7caf46687477"},{"url":"https://git.kernel.org/stable/c/e8852ae29868e449fdb47eebc28f35fb80741a5f"},{"url":"https://git.kernel.org/stable/c/f8d420949b335a4b51d06ab276beee6b8dfdc909"},{"url":"https://git.kernel.org/stable/c/5e658b9245a52d838ef93729a7bc07de8e19deb7"},{"url":"https://git.kernel.org/stable/c/293a84fa40b3a1b3471c0545722724bc10973f76"},{"url":"https://git.kernel.org/stable/c/5b08dccecf825cbf905f348bc6ccb497507e28e2"}],"title":"ntfs3: reject direct userspace writes to reserved $LX* xattrs","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63833","datePublished":"2026-07-19T12:02:25.469Z","dateReserved":"2026-07-19T07:54:57.015Z","dateUpdated":"2026-07-20T13:40:36.626Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 12:16:56","lastModifiedDate":"2026-07-20 15:16:50","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":1.8,"impactScore":5.2}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63833","Ordinal":"1","Title":"ntfs3: reject direct userspace writes to reserved $LX* xattrs","CVE":"CVE-2026-63833","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63833","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: reject direct userspace writes to reserved $LX* xattrs\n\nNTFS3 uses $LXUID, $LXGID, $LXMOD and $LXDEV as internal WSL\npermission metadata and reloads them into i_uid, i_gid and i_mode\nfrom ntfs_get_wsl_perm().\n\nBecause the empty-prefix xattr handler also lets file owners call\nsetxattr() on these names directly, an unprivileged writer on a\nwritable ntfs3 mount can plant root ownership and S_ISUID on their own\nfile and gain euid 0 after inode reload.\n\nReject direct userspace writes to the reserved $LX* names. Internal\nntfs3 metadata updates are unchanged because ntfs_save_wsl_perm()\nwrites them via ntfs_set_ea() directly.\n\n[almaz.alexandrovich@paragon-software.com: added an additional check for non privileged users]","Type":"Description","Title":"ntfs3: reject direct userspace writes to reserved $LX* xattrs"}]}}}