fs/ntfs3: bound DeleteIndexEntryAllocation memmove length

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72197
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:21:38 UTC
Updated2026-08-17 06:18:20 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound DeleteIndexEntryAllocation memmove length In do_action()'s DeleteIndexEntryAllocation case, e->size comes from an on-disk INDEX_BUFFER entry. When e->size makes e + e->size point past hdr + hdr->used, PtrOffset(e1, Add2Ptr(hdr, used)) returns a negative ptrdiff_t that is silently cast to a quasi-infinite size_t when passed to memmove(). The memmove then walks past the destination buffer. The sibling DeleteIndexEntryRoot case at fslog.c:3540-3543 already carries the corresponding guard: if (PtrOffset(e1, Add2Ptr(hdr, used)) < esize || Add2Ptr(e, esize) > Add2Ptr(lrh, rec_len) || used + esize > le32_to_cpu(hdr->total)) { goto dirty_vol; } Apply the same shape to the allocation-path case. Also reject esize == 0: memmove(e, e, ...) is a no-op and leaves hdr->used unchanged, hiding a malformed entry from the existing check_index_header() walk. Reproduced under UML+KASAN on mainline 8d90b09e6741 by mounting a crafted NTFS image: the unguarded memmove takes a length of 0xffffffffffffff00 and the kernel oopses in memmove+0x81/0x1a0 on the do_action+0x36a2 frame. [[email protected]: clang-formatted the changes]

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001820000 probability, percentile 0.081070000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.4HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 c38ed2ab62fab75fd6d0fdc2bee540fbebc7b959 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 b509b9613f20dc5b653d54bf78fab00d79cc43c8 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 4c8aac931c1cd70347961ba5157aa916448c6a25 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 f383aae59ec3994c14804f4191c59038b206be81 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 09fddd52c1b0cef2c086d61be8f3d5dc92e36565 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 554700c65d398276cb00a8ef95f1d5e00b9eff93 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 fc4626bb3656362de8b0ecd56605d47a19ec3518 git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/554700c65d398276cb00a8ef95f1d5e00b9eff93 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4c8aac931c1cd70347961ba5157aa916448c6a25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/09fddd52c1b0cef2c086d61be8f3d5dc92e36565 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b509b9613f20dc5b653d54bf78fab00d79cc43c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f383aae59ec3994c14804f4191c59038b206be81 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c38ed2ab62fab75fd6d0fdc2bee540fbebc7b959 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fc4626bb3656362de8b0ecd56605d47a19ec3518 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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