{"id":82247,"date":"2026-07-19T15:46:56","date_gmt":"2026-07-19T12:16:56","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-63833-ntfs3-reject-direct-userspace-writes-to-reserved-lx-xattrs\/"},"modified":"2026-07-19T15:46:56","modified_gmt":"2026-07-19T12:16:56","slug":"cve-2026-63833-ntfs3-reject-direct-userspace-writes-to-reserved-lx-xattrs","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-63833-ntfs3-reject-direct-userspace-writes-to-reserved-lx-xattrs\/","title":{"rendered":"CVE-2026-63833 &#8211; ntfs3: reject direct userspace writes to reserved $LX* xattrs"},"content":{"rendered":"<p>CVE ID :CVE-2026-63833<\/p>\n<p>  Published : July 19, 2026, 12:16 p.m. | 1\u00a0hour, 23\u00a0minutes ago<\/p>\n<p>  Description :In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>ntfs3: reject direct userspace writes to reserved $LX* xattrs<\/p>\n<p>NTFS3 uses $LXUID, $LXGID, $LXMOD and $LXDEV as internal WSL<br \/>\npermission metadata and reloads them into i_uid, i_gid and i_mode<br \/>\nfrom ntfs_get_wsl_perm().<\/p>\n<p>Because the empty-prefix xattr handler also lets file owners call<br \/>\nsetxattr() on these names directly, an unprivileged writer on a<br \/>\nwritable ntfs3 mount can plant root ownership and S_ISUID on their own<br \/>\nfile and gain euid 0 after inode reload.<\/p>\n<p>Reject direct userspace writes to the reserved $LX* names. Internal<br \/>\nntfs3 metadata updates are unchanged because ntfs_save_wsl_perm()<br \/>\nwrites them via ntfs_set_ea() directly.<\/p>\n[almaz.alexandrovich@paragon-software.com: added an additional check for non privileged users]\n<p>  Severity: 0.0 | NA<\/p>\n<p>  Visit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID :CVE-2026-63833 Published : July 19, 2026, 12:16 p.m. | 1\u00a0hour, 23\u00a0minutes ago Description :In the Linux kernel, the following vulnerability has been resolved: ntfs3: reject direct userspace writes to reserved $LX* xattrs NTFS3 uses $LXUID, $LXGID, $LXMOD and $LXDEV as internal WSL permission metadata and reloads them into i_uid, i_gid and i_mode from &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-82247","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82247","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=82247"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82247\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=82247"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=82247"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=82247"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}