CVE-2026-63833
CVE CVE-2026-63833EUVD EUVD-2026-45499Published 2026-07-19T12:02:25.000ZLast changed 2026-08-05T12:36:16.000ZCVSS 7.1
What the advisory describes
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 ntfs_get_wsl_perm(). Because the empty-prefix xattr handler also lets file owners call setxattr() on these names directly, an unprivileged writer on a writable ntfs3 mount can plant root ownership and S_ISUID on their own file and gain euid 0 after inode reload. Reject direct userspace writes to the reserved $LX* names. Internal ntfs3 metadata updates are unchanged because ntfs_save_wsl_perm() writes them via ntfs_set_ea() directly. [almaz.alexandrovich@paragon-software.com: added an additional check for non privileged users]
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux be71b5cba2e6485e8959da7a9f9a44461a1bb074 <5e658b9245a52d838ef93729a7bc07de8e19deb7; be71b5cba2e6485e8959da7a9f9a44461a1bb074 <293a84fa40b3a1b3471c0545722724bc10973f76; be71b5cba2e6485e8959da7a9f9a44461a1bb074 <2c3cd6da4a14380ef79e34bd9dff7caf46687477; patch: 6.1.177; patch: 5.15.211; patch: 6.6.144; be71b5cba2e6485e8959da7a9f9a44461a1bb074 <f8d420949b335a4b51d06ab276beee6b8dfdc909; patch: 0; patch: 7.1.3; patch: 6.12.95; patch: 7.2-rc1; 5.15; be71b5cba2e6485e8959da7a9f9a44461a1bb074 <e574af95234afc3c725988bbc1fdeb46b9f386a4; patch: 6.18.38; be71b5cba2e6485e8959da7a9f9a44461a1bb074 <e8852ae29868e449fdb47eebc28f35fb80741a5f; be71b5cba2e6485e8959da7a9f9a44461a1bb074 <5b08dccecf825cbf905f348bc6ccb497507e28e2
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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