fs/ntfs3: reject out-of-range evcn in mi_enum_attr()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90199
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:14 UTC
Updated2026-10-19 09:19:09 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: reject out-of-range evcn in mi_enum_attr() In mi_enum_attr(), the start/end VCN validation for non-resident attributes is: if (svcn > evcn + 1) goto out; When evcn is U64_MAX the "evcn + 1" expression wraps to 0 and any svcn passes the check. For evcn values close to U64_MAX (but not equal to it) the right-hand side is still a meaningless near-wrap upper bound, so a malformed on-disk attribute with svcn == 0 and evcn near U64_MAX can pass mi_enum_attr() unrejected. VCN (virtual cluster number) is a cluster index, so any valid evcn is bounded by the volume's total cluster count, which ntfs3 holds in sbi->used.bitmap.nbits (set up in ntfs_init_from_boot() before any caller of mi_enum_attr() runs). Reject evcn values that fall outside this range. However, an empty non-resident attribute (no allocated clusters) is legitimately encoded with svcn == 0 and evcn == -1 (U64_MAX), e.g. via attr->nres.evcn = cpu_to_le64((u64)vcn - 1) with vcn == 0. That sentinel must keep passing, so exclude evcn == U64_MAX from the range check. The existing "svcn > evcn + 1" test still tolerates the sentinel ("0 > 0" is false) and continues to require svcn == 0 for it, while the range check rejects every other out-of-range evcn and thereby also defuses the "evcn + 1" wraparound. svcn does not need its own bound: once evcn < nbits, "svcn > evcn + 1" implies svcn <= nbits. [[email protected]: fixed evcn check]

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: 0.001740000 probability, percentile 0.071090000 (date 2026-09-21)

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 013ff63b649475f0ee134e2c8d0c8e65284ede50 0441e34ce098c19185a7b52c5b8b89a8a5b26888 git Not specified
CNA Linux Linux affected 013ff63b649475f0ee134e2c8d0c8e65284ede50 7ab69cef49ebdfee288287d62641b24ab1445ecc git Not specified
CNA Linux Linux affected 013ff63b649475f0ee134e2c8d0c8e65284ede50 ce9a619c432b9a4044fee115c5483fbed946c131 git Not specified
CNA Linux Linux affected 013ff63b649475f0ee134e2c8d0c8e65284ede50 2b9a0e57bfd365e2096706b19ae34dce3b4a884b git Not specified
CNA Linux Linux affected 013ff63b649475f0ee134e2c8d0c8e65284ede50 20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3 git Not specified
CNA Linux Linux affected a7accf181a4709a6e380360372150cc4a1b6b89a git Not specified
CNA Linux Linux affected 3dfd727873c3e8da74a2e3907120ff052c5f0bcc git Not specified
CNA Linux Linux affected 1d7dd485108d4f633b543c9c14071cc325b68ae5 git Not specified
CNA Linux Linux affected 5.15.209 5.16 semver Not specified
CNA Linux Linux affected 6.1.115 6.2 semver Not specified
CNA Linux Linux affected 6.5.11 6.6 semver Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0441e34ce098c19185a7b52c5b8b89a8a5b26888 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ce9a619c432b9a4044fee115c5483fbed946c131 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7ab69cef49ebdfee288287d62641b24ab1445ecc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/20fd9f64c0050658f2031e6bd5d552c6f0c8f7e3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b9a0e57bfd365e2096706b19ae34dce3b4a884b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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