CVE-2026-89653
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, the ceph module has a vulnerability due to failure to reject export_targets ranks >= CEPH_MAX_MDS during mdsmap decode. The check_new_map() function uses each entry as a bit number in a fixed stack bitmap, so a rank outside the protocol namespace can cause set_bit() to write past the array.
Risk Assessment
A malicious or compromised Ceph monitor can supply a crafted MDS map causing an out-of-bounds stack write and potential code execution in kernel context. This affects confidentiality, integrity, and availability of Ceph clients.
Recommendation
Update the Linux kernel to a version with the fix that rejects ranks outside CEPH_MAX_MDS during map decoding. Limit trust in Ceph monitors within the cluster.
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Original NVD description (English source)
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.