nvdimm/btt: reject an arena whose nfree is below the lane count

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89965
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:17:07 UTC
Updated2026-09-16 15:18:20 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nvdimm/btt: reject an arena whose nfree is below the lane count The BTT info block's nfree field, the number of reserve free blocks, is read from the medium without validation. btt_freelist_init() and btt_rtt_init() size the per-lane freelist[] and rtt[] arrays by nfree, but the I/O path indexes them by the lane from nd_region_acquire_lane(), which is bounded by nd_region->num_lanes (ND_MAX_LANES), not by nfree. A crafted or foreign arena whose nfree is below the lane count makes freelist[lane]/rtt[lane] run past the allocation: an out-of-bounds write. btt.rst documents the nlanes = min(nfree, num_cpus) invariant, which the code does not currently honor: num_lanes is ND_MAX_LANES regardless of nfree. Reject an arena whose nfree is below num_lanes at discovery, before the per-lane arrays are allocated, enforcing that invariant.

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

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 5212e11fde4d40fa627668b4f2222d20db488f71 eb491343d2d1784121ad9af91c25b338c28913c3 git Not specified
CNA Linux Linux affected 5212e11fde4d40fa627668b4f2222d20db488f71 59d5cd1f42b4bab3609512c3cb3d3540d3d21da7 git Not specified
CNA Linux Linux affected 5212e11fde4d40fa627668b4f2222d20db488f71 f6c5313aae794ecca8f762c1a3493de5c266f120 git Not specified
CNA Linux Linux affected 5212e11fde4d40fa627668b4f2222d20db488f71 f9bf05c63b77d000e9c01f3e47af36973887d350 git Not specified
CNA Linux Linux affected 5212e11fde4d40fa627668b4f2222d20db488f71 6f79d1a5f2611a3d36e9312be5425cd9cb397c51 git Not specified
CNA Linux Linux affected 5212e11fde4d40fa627668b4f2222d20db488f71 6b1faf1f099f7060b5f1f2f0d024132581f1726e git Not specified
CNA Linux Linux affected 5212e11fde4d40fa627668b4f2222d20db488f71 9dfa11cef4750b67591307f2c62e47a23d60e4b7 git Not specified
CNA Linux Linux affected 5212e11fde4d40fa627668b4f2222d20db488f71 6a1f2e5ed9267ca19187038ac635393c165213ac git Not specified
CNA Linux Linux affected 4.2 Not specified
CNA Linux Linux unaffected 4.2 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* 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 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9dfa11cef4750b67591307f2c62e47a23d60e4b7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eb491343d2d1784121ad9af91c25b338c28913c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6a1f2e5ed9267ca19187038ac635393c165213ac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6b1faf1f099f7060b5f1f2f0d024132581f1726e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f6c5313aae794ecca8f762c1a3493de5c266f120 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f9bf05c63b77d000e9c01f3e47af36973887d350 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/59d5cd1f42b4bab3609512c3cb3d3540d3d21da7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6f79d1a5f2611a3d36e9312be5425cd9cb397c51 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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