138 lines
9.1 KiB
JSON
138 lines
9.1 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-90133",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.788Z",
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"datePublished": "2026-09-17T16:06:33.234Z",
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"dateUpdated": "2026-10-19T08:58:31.458Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:58:31.458Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: Fix index_root heap OOB write in ntfs_ir_to_ib()\n\nntfs_ir_to_ib copies all entries from index_root into a freshly allocated\nindex_block_size-byte buffer without verifying that the entries fit in the\navailable space. The entries in index_root may be larger than the usable\nentry space in the index block.\n\nThis can cause OOB writes past the end of the allocation.\n\nThe validator ntfs_index_root_inconsistent() checks that entries are\nself-consistent within the IR value, but never cross-checks them against\nindex_block_size. There is no bounds check in ntfs_ir_to_ib() before the\nmemcpy.\n\nFixing this at the sink in ntfs_ir_to_ib() since\nntfs_index_root_inconsistent() validates the logical consistency of\nindex_root as a structure and a root with large entries is a structurally\nvalid root. The bug is a size conflict of ntfs_ir_to_ib().\nAlso, the validator is called once per inode load in\nntfs_read_locked_inode() while ntfs_ir_to_ib() is only called during a\nreparent, a check there adds no overhead to the common path.\nMoreover, even a future call path that bypasses the validator would still\nbe protected.\n\nWith NULL as first parameter of ntfs_error(), the volume error flag is\nnever set by this call, so the device name will be absent from the error\nmessage. In any case, that the caller, ntfs_ir_reparent(), prints an error\nmessage that includes the device name on NULL returns.\nI think this is the best solution available without adding\n'struct super_block *sb' as a parameter to ntfs_ir_to_ib().\n\nThis heap out-of-bounds write is triggered by a crafted filesystem image,\nwhich is not in the kernel threat model, anyway, fixing memory errors would\nbe nice to keep things secure."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The overflow source is on-disk $INDEX_ROOT (ir->index_block_size and the resident entries) that ntfs_ir_to_ib() memcpy()s; the trigger is vfs_create/mkdir/link/rename → ntfs_create/__ntfs_link → ntfs_index_add_filename → ntfs_ie_add → ntfs_ir_make_space → ntfs_ir_reparent. No protocol message carries those fields.\nAC:L - ntfs_read_locked_inode() accepts any power-of-two index_block_size in [512, PAGE_SIZE] and ntfs_index_root_inconsistent() never compares entry bytes to that size, so a 512-byte IB plus a packed resident INDEX_ROOT in a full MFT record makes ntfs_ir_truncate() return -ENOSPC and ntfs_ir_reparent() run on the next create, with no race.\nPR:N - mount_capable() needs init-namespace CAP_SYS_ADMIN because ntfs_fs_type lacks FS_USERNS_MOUNT; that mount is the victim or udisks2/vold action (UI:R), not attacker privilege. After mount, ntfs_create() is an ordinary VFS create on a directory whose mode the image controls, so the attacker needs no account.\nUI:R - ntfs_ir_to_ib() is called only from ntfs_ir_reparent(), not from ntfs_fill_super(), so attaching the volume is not enough. A victim or automounter must mount the attacker-supplied NTFS image, and then create/mkdir/link/rename must add a filename so ntfs_ie_add() takes the ENOSPC reparent path.\nS:U - The kvzalloc(index_block) overflow in ntfs_ir_to_ib() corrupts host-kernel heap in the same OS authority as fs/ntfs; it is in-kernel memory corruption, not a VM escape, IOMMU bypass, or sandbox breakout.\nC:H - memcpy() in ntfs_ir_to_ib() writes attacker-controlled INDEX_ROOT entry bytes (UTF-16 names, MFT refs) past the kvzalloc(ir->index_block_size) object into adjacent slab, a heap OOB write that can be groomed to disclose neighboring kernel objects.\nI:H - The same memcpy is an unbounded heap out-of-bounds write of attacker-chosen index-entry contents past the allocated index_block, which can corrupt adjacent slab objects and hijack kernel control flow.\nA:H - Writing past the kvzalloc index_block into unmapped or poisoned adjacent heap oopses or panics on the ntfs_ir_reparent() create/mkdir path, fully denying availability even when the overflow is not turned into a write primitive."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ntfs/index.c"
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],
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"versions": [
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{
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"version": "0a8ac0c1fa0b99a5b29002bc7f232ed7eafddef0",
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"lessThan": "825dec5120933e90c54e30e31ccfa6c3449043a8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0a8ac0c1fa0b99a5b29002bc7f232ed7eafddef0",
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"lessThan": "dc09bf79b76f9a7157e225f449655f3f62f96c9c",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ntfs/index.c"
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],
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"versions": [
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{
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"version": "7.1",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "7.1",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.1",
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"versionEndExcluding": "7.2.6"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.1",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/825dec5120933e90c54e30e31ccfa6c3449043a8"
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},
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{
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"url": "https://git.kernel.org/stable/c/dc09bf79b76f9a7157e225f449655f3f62f96c9c"
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}
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],
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"title": "ntfs: Fix index_root heap OOB write in ntfs_ir_to_ib()",
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"x_generator": {
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} |