GHSA-683X-GQV7-78PP
Vulnerability from github – Published: 2026-09-16 09:30 – Updated: 2026-09-16 09:30In the Linux kernel, the following vulnerability has been resolved:
fs/ntfs3: fix out-of-bounds read of INDEX_ROOT in reparse/objid init
ntfs_reparse_init() and ntfs_objid_init() parse the index root of the $Extend/$Reparse and $Extend/$ObjId metafiles (the INDEX_ROOT attributes named $R and $O). They read its type and rule fields through resident_data(), which does not check that the resident attribute is large enough to hold them.
mi_enum_attr() accepts a resident attribute with data_off == asize and data_size == 0. For such an attribute placed last in its MFT record, resident_data() returns a pointer to the end of the record_size buffer, so reading root->type / root->rule reads past the allocation.
Use resident_data_ex(attr, sizeof(struct INDEX_ROOT)) and bail out when it returns NULL, as ntfs_security_init() already does for $SDH / $SII.
The attribute is only parsed while mounting a crafted image, so this needs CAP_SYS_ADMIN.
BUG: KASAN: slab-out-of-bounds in ntfs_reparse_init (fs/ntfs3/fsntfs.c:2306) Read of size 4 at addr ffff88801219dc00 by task mount ntfs_reparse_init (fs/ntfs3/fsntfs.c:2306) ntfs_fill_super (fs/ntfs3/super.c:1604) get_tree_bdev_flags (fs/super.c:1703) vfs_get_tree (fs/super.c:1758) path_mount (fs/namespace.c:4131) __x64_sys_mount (fs/namespace.c:4360)
{
"affected": [],
"aliases": [
"CVE-2026-89785"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-16T09:17:09Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix out-of-bounds read of INDEX_ROOT in reparse/objid init\n\nntfs_reparse_init() and ntfs_objid_init() parse the index root of the\n$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)",
"id": "GHSA-683x-gqv7-78pp",
"modified": "2026-09-16T09:30:30Z",
"published": "2026-09-16T09:30:30Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89785"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2064bc663f89e61b8681c1fb9d1ce445de72063d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/64bb6000bfbdf241a6dd578199acd90321a4243e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/66c074eab6f966fbe48a0fc4b3a45b2a2e2df527"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/72caafbc95c5dca8266a942b8e96ad81d8d9adc7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/94fce1d3e74fe011e21f17490ba58491709fd7e5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bd631e2005290a55c8edda87363bc0d594c01705"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/eb80003744e32a7366a523015e4acfe0a2ac7d88"
}
],
"schema_version": "1.4.0",
"severity": []
}
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