277 lines
15 KiB
JSON
277 lines
15 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-2026-72197",
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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": "2026-08-09T03:40:39.911Z",
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"datePublished": "2026-08-15T05:53:56.149Z",
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"dateUpdated": "2026-10-16T18:45:01.720Z"
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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": "2026-08-17T05:41:24.114Z"
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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\nfs/ntfs3: bound DeleteIndexEntryAllocation memmove length\n\nIn do_action()'s DeleteIndexEntryAllocation case, e->size comes\nfrom an on-disk INDEX_BUFFER entry. When e->size makes\ne + e->size point past hdr + hdr->used,\nPtrOffset(e1, Add2Ptr(hdr, used)) returns a negative ptrdiff_t\nthat is silently cast to a quasi-infinite size_t when passed\nto memmove(). The memmove then walks past the destination\nbuffer.\n\nThe sibling DeleteIndexEntryRoot case at fslog.c:3540-3543\nalready carries the corresponding guard:\n\n\tif (PtrOffset(e1, Add2Ptr(hdr, used)) < esize ||\n\t Add2Ptr(e, esize) > Add2Ptr(lrh, rec_len) ||\n\t used + esize > le32_to_cpu(hdr->total)) {\n\t\tgoto dirty_vol;\n\t}\n\nApply the same shape to the allocation-path case. Also reject\nesize == 0: memmove(e, e, ...) is a no-op and leaves\nhdr->used unchanged, hiding a malformed entry from the\nexisting check_index_header() walk.\n\nReproduced under UML+KASAN on mainline 8d90b09e6741 by\nmounting a crafted NTFS image: the unguarded memmove takes a\nlength of 0xffffffffffffff00 and the kernel oopses in\nmemmove+0x81/0x1a0 on the do_action+0x36a2 frame.\n\n[almaz.alexandrovich@paragon-software.com: clang-formatted the changes]"
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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:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.4,
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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 - Reachable only by mounting attacker-controlled NTFS media via the local mount syscall path (path_mount→ntfs_fill_super→ntfs_loadlog_and_replay→log_replay→do_action); ntfs3 parses on-disk $LogFile redo records, not remote network packets.\nAC:L - The attacker fully controls crafted $LogFile DeleteIndexEntryAllocation redo data and INDEX_BUFFER entry sizes on disk, so the PtrOffset underflow to ~0xffffffffffffff00 and subsequent memmove OOB are deterministic with no race or uncontrollable layout preconditions.\nPR:N - No privileges on the target are required; exploitation only needs a malicious NTFS image presented to ntfs3 (USB/loop/NBD block device) that root, udisks2/systemd automount, or an image-handling service mounts, matching the kernel CNA model for crafted-filesystem bugs.\nUI:N - On desktops/kiosks/automotive systems where udisks2 or systemd automounts removable NTFS media, inserting or attaching the crafted image triggers log_replay during mount with no further deliberate victim action beyond routine media handling.\nS:U - The quasi-infinite memmove corrupts kernel heap memory within the host OS security authority during ntfs3 journal replay; this is standard kernel memory corruption, not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - The unchecked memmove length (~0xffffffffffffff00) performs a massive out-of-bounds read from beyond the kmalloc INDEX_BUFFER scratch buffer, exposing adjacent slab/heap contents and satisfying OOB-read/arbitrary-disclosure guidance even though KASAN reports an oops in memmove.\nI:H - The same memmove writes far past the destination INDEX_BUFFER allocation in kernel heap, yielding a large out-of-bounds write primitive that can corrupt adjacent kernel objects and be leveraged for control-flow hijacking or privilege escalation.\nA:H - Reproduced by mounting a crafted NTFS image under UML+KASAN, the unbounded memmove oopses the kernel in memmove from do_action; such heap corruption reliably threatens panic/oops and full denial of service on mount."
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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/ntfs3/fslog.c"
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],
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{
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"version": "b46acd6a6a627d876898e1c84d3f84902264b445",
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"status": "affected",
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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/ntfs3/fslog.c"
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],
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{
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"version": "5.15",
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"status": "affected"
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"version": "0",
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"status": "unaffected",
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},
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{
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"version": "5.15.212",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.178",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.145",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.97",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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},
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},
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{
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"version": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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},
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{
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"version": "7.2",
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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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"title": "fs/ntfs3: bound DeleteIndexEntryAllocation memmove length",
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-72197",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T18:43:48.330736Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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} |