ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89653
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:51 UTC
Updated2026-09-14 13:19:17 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode MDSMap export_targets entries are monitor controlled. check_new_map() uses each entry as a bit number in a fixed stack bitmap, so a rank outside the protocol namespace can make set_bit() write past the end of the array. Reject ranks outside CEPH_MAX_MDS while decoding the map. Do not validate against possible_max_rank here because maps may legitimately reference ranks beyond a temporarily reduced max_mds.

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 0.388700000 (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 d517b3983dd3106ca92d6c5d0d09415a4a09481c 3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe git Not specified
CNA Linux Linux affected d517b3983dd3106ca92d6c5d0d09415a4a09481c 8c823bbab3c24e657469a84db96902ba82d4e8bb git Not specified
CNA Linux Linux affected d517b3983dd3106ca92d6c5d0d09415a4a09481c c4addccd05bacbef2144b4db14853d0308a218ac git Not specified
CNA Linux Linux affected d517b3983dd3106ca92d6c5d0d09415a4a09481c 736adee11af36e407ed902264f8b2fb5cf94b62f git Not specified
CNA Linux Linux affected d517b3983dd3106ca92d6c5d0d09415a4a09481c 4d298880f82c42383b36946bafde7ccf4d804c9b git Not specified
CNA Linux Linux affected d517b3983dd3106ca92d6c5d0d09415a4a09481c 96c3f5fbb0d5386e7111426f047f98cec4586674 git Not specified
CNA Linux Linux affected d517b3983dd3106ca92d6c5d0d09415a4a09481c aedc9053d909508a5f56c3f49f885fc030df4730 git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 5.15.221 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/8c823bbab3c24e657469a84db96902ba82d4e8bb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c4addccd05bacbef2144b4db14853d0308a218ac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/96c3f5fbb0d5386e7111426f047f98cec4586674 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aedc9053d909508a5f56c3f49f885fc030df4730 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/736adee11af36e407ed902264f8b2fb5cf94b62f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4d298880f82c42383b36946bafde7ccf4d804c9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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