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
Updated2026-09-11 20:19:51 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
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 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/96c3f5fbb0d5386e7111426f047f98cec4586674 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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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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