fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot

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Summary

CVECVE-2026-45935
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:09 UTC
Updated2026-05-30 11:17:16 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot In the 'DeleteIndexEntryRoot' case of the 'do_action' function, the entry size ('esize') is retrieved from the log record without adequate bounds checking. Specifically, the code calculates the end of the entry ('e2') using: e2 = Add2Ptr(e1, esize); It then calculates the size for memmove using 'PtrOffset(e2, ...)', which subtracts the end pointer from the buffer limit. If 'esize' is maliciously large, 'e2' exceeds the used buffer size. This results in a negative offset which, when cast to size_t for memmove, interprets as a massive unsigned integer, leading to a heap buffer overflow. This commit adds a check to ensure that the entry size ('esize') strictly fits within the remaining used space of the index header before performing memory operations.

Risk And Classification

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

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

EPSS: 0.000120000 probability, percentile 0.018660000 (date 2026-06-01)

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

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 36c03f7f177b34d51f1cf1d2304b1074607bf4b0 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 b271c9cb85927210b1b799e55ee7f702d12b4336 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 a584b9d1059b29e97e17c919274e9adfb846f2a0 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 c065541b71b79874c83d418a9acd18ad5826339b git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 78942172d5bff4d4afed8674abc09cc560ce44a0 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 f3b437a4c3e022a1449658ae9f3dd34859894513 git Not specified
CNA Linux Linux affected b46acd6a6a627d876898e1c84d3f84902264b445 b2bc7c44ed1779fc9eaab9a186db0f0d01439622 git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 5.15.202 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.14 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/36c03f7f177b34d51f1cf1d2304b1074607bf4b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f3b437a4c3e022a1449658ae9f3dd34859894513 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/78942172d5bff4d4afed8674abc09cc560ce44a0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b2bc7c44ed1779fc9eaab9a186db0f0d01439622 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a584b9d1059b29e97e17c919274e9adfb846f2a0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c065541b71b79874c83d418a9acd18ad5826339b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b271c9cb85927210b1b799e55ee7f702d12b4336 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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