{"id":"CVE-2026-89785","published":"2026-09-16T09:17:09.203","lastModified":"2026-09-16T09:17:09.203","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix out-of-bounds read of INDEX_ROOT in reparse/objid init\n\nntfs_reparse_init() and ntfs_objid_init() parse the index root of the\n$Extend/$Reparse and $Extend/$ObjId metafiles (the INDEX_ROOT attributes\nnamed $R and $O). They read its type and rule fields through\nresident_data(), which does not check that the resident attribute is\nlarge enough to hold them.\n\nmi_enum_attr() accepts a resident attribute with data_off == asize and\ndata_size == 0. For such an attribute placed last in its MFT record,\nresident_data() returns a pointer to the end of the record_size buffer,\nso reading root->type / root->rule reads past the allocation.\n\nUse resident_data_ex(attr, sizeof(struct INDEX_ROOT)) and bail out when\nit returns NULL, as ntfs_security_init() already does for $SDH / $SII.\n\nThe attribute is only parsed while mounting a crafted image, so this\nneeds CAP_SYS_ADMIN.\n\n BUG: KASAN: slab-out-of-bounds in ntfs_reparse_init (fs/ntfs3/fsntfs.c:2306)\n Read of size 4 at addr ffff88801219dc00 by task mount\n  ntfs_reparse_init (fs/ntfs3/fsntfs.c:2306)\n  ntfs_fill_super (fs/ntfs3/super.c:1604)\n  get_tree_bdev_flags (fs/super.c:1703)\n  vfs_get_tree (fs/super.c:1758)\n  path_mount (fs/namespace.c:4131)\n  __x64_sys_mount (fs/namespace.c:4360)","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/2064bc663f89e61b8681c1fb9d1ce445de72063d","tags":[]},{"url":"https://git.kernel.org/stable/c/64bb6000bfbdf241a6dd578199acd90321a4243e","tags":[]},{"url":"https://git.kernel.org/stable/c/66c074eab6f966fbe48a0fc4b3a45b2a2e2df527","tags":[]},{"url":"https://git.kernel.org/stable/c/72caafbc95c5dca8266a942b8e96ad81d8d9adc7","tags":[]},{"url":"https://git.kernel.org/stable/c/94fce1d3e74fe011e21f17490ba58491709fd7e5","tags":[]},{"url":"https://git.kernel.org/stable/c/bd631e2005290a55c8edda87363bc0d594c01705","tags":[]},{"url":"https://git.kernel.org/stable/c/eb80003744e32a7366a523015e4acfe0a2ac7d88","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}