DEBIAN-CVE-2026-72185

In the Linux kernel, the following vulnerability has been resolved:  ntfs: fix WARNON for resident attribute in ntfsmaprunlistnolock()  When ntfsmaprunlistnolock() 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 WARNON(), 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:    ntfsmaprunlistnolock   ntfsemptylogfile   loadsystemfiles   ntfsfillsuper  In this path ctx is NULL, so ntfsmaprunlistnolock() 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.