by Kastro CVE-2026-89653
Linux Linux — ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode
Description · from the CVE record
In 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.
Affected
ProductAffectedFixed inSource
Linuxd517b3983dd3106ca92d6c5d0d09415a4a09481c – < 3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe3740c88ca9cb2210a8dbdd55ea4cec119fbe86feCNA
Linuxd517b3983dd3106ca92d6c5d0d09415a4a09481c – < 8c823bbab3c24e657469a84db96902ba82d4e8bb8c823bbab3c24e657469a84db96902ba82d4e8bbCNA
Linuxd517b3983dd3106ca92d6c5d0d09415a4a09481c – < c4addccd05bacbef2144b4db14853d0308a218acc4addccd05bacbef2144b4db14853d0308a218acCNA
Linuxd517b3983dd3106ca92d6c5d0d09415a4a09481c – < 736adee11af36e407ed902264f8b2fb5cf94b62f736adee11af36e407ed902264f8b2fb5cf94b62fCNA
Linuxd517b3983dd3106ca92d6c5d0d09415a4a09481c – < 4d298880f82c42383b36946bafde7ccf4d804c9b4d298880f82c42383b36946bafde7ccf4d804c9bCNA
Linuxd517b3983dd3106ca92d6c5d0d09415a4a09481c – < 96c3f5fbb0d5386e7111426f047f98cec458667496c3f5fbb0d5386e7111426f047f98cec4586674CNA
Linuxd517b3983dd3106ca92d6c5d0d09415a4a09481c – < aedc9053d909508a5f56c3f49f885fc030df4730aedc9053d909508a5f56c3f49f885fc030df4730CNA
Linux5.155.15.221CNA
Scores by source
Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total