CVE-2026-72185

In the Linux kernel, the following vulnerability has been resolved:

ntfs: fix WARNON for resident attribute in ntfsmaprunlistnolock()

When ntfsmaprunlist_nolock() needs to look up the attribute extent

containing a target VCN (ctxneedsreset == true), it calls

ntfsattrlookup() and then expects the result to be a non-resident

attribute, since only non-resident attributes have a mapping pairs

array to decompress.

A crafted NTFS image can place a resident attribute where a non-resident

one is expected, causing ntfsattrlookup() to succeed but return a

resident attribute record.  Previously this was caught only by a

WARN_ON(), which does not stop execution.  The code then falls through to

read a->data.nonresident.highestvcn from what is actually a resident

attribute, accessing the wrong union member and corrupting the VCN range

check.

The caller path triggering this warning during mount is:

  ntfsmaprunlist_nolock

  ntfsemptylogfile

  loadsystemfiles

  ntfsfillsuper

In this path ctx is NULL, so ntfsmaprunlist_nolock() allocates a

temporary search context internally and sets ctxneedsreset = true.

The existing resident-attribute guard in the ctx != NULL branch already

returns -EIO silently for the same condition; make the ctxneedsreset

path consistent by replacing the WARN_ON() with the same -EIO error

return.

This causes the crafted image to be rejected with a mount error instead

of triggering a kernel warning.