fs/ntfs3: fix out-of-bounds read of INDEX_ROOT in reparse/objid init

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89785
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 09:17:09 UTC
Updated2026-09-16 09:17:09 UTC
DescriptionIn 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)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 82cae269cfa953032fbb8980a7d554d60fb00b17 eb80003744e32a7366a523015e4acfe0a2ac7d88 git Not specified
CNA Linux Linux affected 82cae269cfa953032fbb8980a7d554d60fb00b17 bd631e2005290a55c8edda87363bc0d594c01705 git Not specified
CNA Linux Linux affected 82cae269cfa953032fbb8980a7d554d60fb00b17 94fce1d3e74fe011e21f17490ba58491709fd7e5 git Not specified
CNA Linux Linux affected 82cae269cfa953032fbb8980a7d554d60fb00b17 66c074eab6f966fbe48a0fc4b3a45b2a2e2df527 git Not specified
CNA Linux Linux affected 82cae269cfa953032fbb8980a7d554d60fb00b17 64bb6000bfbdf241a6dd578199acd90321a4243e git Not specified
CNA Linux Linux affected 82cae269cfa953032fbb8980a7d554d60fb00b17 72caafbc95c5dca8266a942b8e96ad81d8d9adc7 git Not specified
CNA Linux Linux affected 82cae269cfa953032fbb8980a7d554d60fb00b17 2064bc663f89e61b8681c1fb9d1ce445de72063d git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/eb80003744e32a7366a523015e4acfe0a2ac7d88 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd631e2005290a55c8edda87363bc0d594c01705 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/64bb6000bfbdf241a6dd578199acd90321a4243e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2064bc663f89e61b8681c1fb9d1ce445de72063d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/94fce1d3e74fe011e21f17490ba58491709fd7e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/66c074eab6f966fbe48a0fc4b3a45b2a2e2df527 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/72caafbc95c5dca8266a942b8e96ad81d8d9adc7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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