libceph: reject buckets with mismatched CRUSH ids

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89656
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:51 UTC
Updated2026-10-16 20:18:24 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: libceph: reject buckets with mismatched CRUSH ids crush_decode() stores bucket data by array slot, and the mapper later derives the per-bucket workspace index from the decoded bucket id. A malformed map can therefore make one bucket reuse another bucket's workspace by encoding an id different from -1 - slot. For uniform buckets, the second replica selection expands the source bucket's permutation into that aliased workspace buffer. If the source bucket is larger than the aliased bucket, the write runs past the smaller permutation array and can escape the kvmalloc'd CRUSH workspace. KASAN reports a slab OOB write of 4 bytes in bucket_perm_choose(). Reject buckets whose encoded id does not match their array slot. Valid CRUSH maps already use the canonical negative id corresponding to the bucket slot, so this restores the invariant expected by work->work[-1 - in->id] without changing valid map behavior.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.004630000 probability, percentile 0.388710000 (date 2026-09-14)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 66a0e2d579dbec5c676cfe446234ffebb267c564 ee59040d6ed1a5f8d10d27174b8f32c90ca8e89a git Not specified
CNA Linux Linux affected 66a0e2d579dbec5c676cfe446234ffebb267c564 baad5875fdd2f5e248250fc3519bb045d64f1716 git Not specified
CNA Linux Linux affected 66a0e2d579dbec5c676cfe446234ffebb267c564 4aeb93daadf388e72073abc204312dd364eeb30a git Not specified
CNA Linux Linux affected 66a0e2d579dbec5c676cfe446234ffebb267c564 6e5c6ce252b1eccfd41670a5cf95ab44f7ba7022 git Not specified
CNA Linux Linux affected 66a0e2d579dbec5c676cfe446234ffebb267c564 3516a4131c4e45d62ee4e42e82c36930e8c1fbbd git Not specified
CNA Linux Linux affected 66a0e2d579dbec5c676cfe446234ffebb267c564 00562ccd4e88d092b9b851df50fad20442bfeb24 git Not specified
CNA Linux Linux affected 66a0e2d579dbec5c676cfe446234ffebb267c564 79900d978158b2d80eef952fc41b9e4dc58d7b83 git Not specified
CNA Linux Linux affected 66a0e2d579dbec5c676cfe446234ffebb267c564 3cde4a8302301679937474a5f7a851394cc1bd11 git Not specified
CNA Linux Linux affected 4.11 Not specified
CNA Linux Linux unaffected 4.11 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 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 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/4aeb93daadf388e72073abc204312dd364eeb30a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3cde4a8302301679937474a5f7a851394cc1bd11 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/baad5875fdd2f5e248250fc3519bb045d64f1716 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/79900d978158b2d80eef952fc41b9e4dc58d7b83 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/00562ccd4e88d092b9b851df50fad20442bfeb24 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ee59040d6ed1a5f8d10d27174b8f32c90ca8e89a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6e5c6ce252b1eccfd41670a5cf95ab44f7ba7022 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3516a4131c4e45d62ee4e42e82c36930e8c1fbbd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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