fs/ntfs3: bound attr_off in UpdateResidentValue against data_off

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72195
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 attr_off in UpdateResidentValue against data_off In do_action()'s UpdateResidentValue case (fslog.c:3307), lrh->attr_off and lrh->redo_len come from the on-disk LRH. When they satisfy aoff + dlen < attr->res.data_off, the assignment attr->res.data_size = cpu_to_le32(aoff + dlen - data_off); underflows to ~4 GiB (e.g. 0xFFFFFFF9 when aoff=0x10, dlen=1, data_off=0x18). Subsequent code that reads attr->res.data_size to walk the resident attribute payload would then read up to 4 GiB past the 1024-byte MFT record allocation. The existing mi_enum_attr() defense in fs/ntfs3/record.c:287 catches the corrupted data_size on the next attribute walk and fails the mount, but only on the path that walks all attributes. A read site that picks an attribute by name and reads its data_size without re-validating is not covered. Validate aoff against data_off and asize at the source. Reproduced under UML+KASAN on mainline 8d90b09e6741 via pr_warn-only probe: with aoff=0x10 and data_off=0x18, the post-assignment data_size is 0xfffffff9 (mount then fails at -22 from mi_enum_attr). [[email protected]: clang-formatted the changes]

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001640000 probability, percentile 0.060860000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 ab8761676d638c5be170aaf91b7ffdd451236616 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 53c12f178f584dc5f836ffe2782138a6e9348ed9 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 546518468e6c9ea469669eef78f8cc380ad6e2ca git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 97758fd9756b5f09e9ddc6a5f6a569041acc8421 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 50b5e83384e7fed3d11d18b79ff350e9d6d89861 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 a89c66674283a0293c0f266dc57087a6114371a3 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 d1570c48f49a693974d000251030370ee2e83539 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/546518468e6c9ea469669eef78f8cc380ad6e2ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/53c12f178f584dc5f836ffe2782138a6e9348ed9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/97758fd9756b5f09e9ddc6a5f6a569041acc8421 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ab8761676d638c5be170aaf91b7ffdd451236616 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d1570c48f49a693974d000251030370ee2e83539 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a89c66674283a0293c0f266dc57087a6114371a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/50b5e83384e7fed3d11d18b79ff350e9d6d89861 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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