{"id":"CVE-2026-63833","revision":"6cbd00eab5354c9a8dbf513854d0c7d1","records":[{"revision":"6cbd00eab5354c9a8dbf513854d0c7d1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63833","aliases":[],"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":0,"publishedAt":"2026-07-19T12:02:25.469+00:00","modifiedAt":"2026-10-19T20:07:49.624+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/ntfs3/xattr.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"be71b5cba2e6485e8959da7a9f9a44461a1bb074\",\n                            \"lessThan\": \"e574af95234afc3c725988bbc1fdeb46b9f386a4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"be71b5cba2e6485e8959da7a9f9a44461a1bb074\",\n                            \"lessThan\": \"2c3cd6da4a14380ef79e34bd9dff7caf46687477\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"be71b5cba2e6485e8959da7a9f9a44461a1bb074\",\n                            \"lessThan\": \"e8852ae29868e449fdb47eebc28f35fb80741a5f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"be71b5cba2e6485e8959da7a9f9a44461a1bb074\",\n                            \"lessThan\": \"f8d420949b335a4b51d06ab276beee6b8dfdc909\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"be71b5cba2e6485e8959da7a9f9a44461a1bb074\",\n                            \"lessThan\": \"5e658b9245a52d838ef93729a7bc07de8e19deb7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"be71b5cba2e6485e8959da7a9f9a44461a1bb074\",\n                            \"lessThan\": \"293a84fa40b3a1b3471c0545722724bc10973f76\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"be71b5cba2e6485e8959da7a9f9a44461a1bb074\",\n                            \"lessThan\": \"5b08dccecf825cbf905f348bc6ccb497507e28e2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/ntfs3/xattr.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.15\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.211\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.177\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.144\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.95\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.38\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.3\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":7.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/e574af95234afc3c725988bbc1fdeb46b9f386a4","https://git.kernel.org/stable/c/2c3cd6da4a14380ef79e34bd9dff7caf46687477","https://git.kernel.org/stable/c/e8852ae29868e449fdb47eebc28f35fb80741a5f","https://git.kernel.org/stable/c/f8d420949b335a4b51d06ab276beee6b8dfdc909","https://git.kernel.org/stable/c/5e658b9245a52d838ef93729a7bc07de8e19deb7","https://git.kernel.org/stable/c/293a84fa40b3a1b3471c0545722724bc10973f76","https://git.kernel.org/stable/c/5b08dccecf825cbf905f348bc6ccb497507e28e2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63833","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63833","identifiers":["CVE-2026-63833"]},"retained":false,"historicalAffected":[]}],"coverage":[]}