{"id":"AZL-101345","summary":"CVE-2026-89785 affecting package kernel 6.6.150.1-1","details":"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-\u003etype / root-\u003erule 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)","modified":"2026-09-18T05:37:08Z","published":"2026-09-16T09:17:09Z","upstream":["CVE-2026-89785"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89785"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.150.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-101345.json"}}],"schema_version":"1.9.0"}