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CVE-2026-63833

ntfs3: reject direct userspace writes to reserved $LX* xattrs

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.38, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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]

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From be71b5cba2e6485e8959da7a9f9a44461a1bb074 · fixed in e574af95234afc3c725988bbc1fdeb46b9f386a4; From be71b5cba2e6485e8959da7a9f9a44461a1bb074 · fixed in 2c3cd6da4a14380ef79e34bd9dff7caf46687477; From be71b5cba2e6485e8959da7a9f9a44461a1bb074 · fixed in e8852ae29868e449fdb47eebc28f35fb80741a5f; From be71b5cba2e6485e8959da7a9f9a44461a1bb074 · fixed in f8d420949b335a4b51d06ab276beee6b8dfdc909; From be71b5cba2e6485e8959da7a9f9a44461a1bb074 · fixed in 5e658b9245a52d838ef93729a7bc07de8e19deb7; From be71b5cba2e6485e8959da7a9f9a44461a1bb074 · fixed in 293a84fa40b3a1b3471c0545722724bc10973f76; From be71b5cba2e6485e8959da7a9f9a44461a1bb074 · fixed in 5b08dccecf825cbf905f348bc6ccb497507e28e2

  • Linux Linux

    5.15

  • KernelLinux

    From 5.15.0 · fixed in 5.15.211; From 5.16.0 · fixed in 6.1.177; From 6.2.0 · fixed in 6.6.144; From 6.7.0 · fixed in 6.12.95; From 6.13.0 · fixed in 6.18.38; From 6.19.0 · fixed in 7.1.3

References 7

git.kernel.org