CVE-2026-89650

A flaw was found in the Linux kernel's Ceph client. A malicious or compromised Ceph monitor, or an on-path attacker, can send a specially crafted Metadata Server MDS map. This map, with an oversized numexporttargets field and a per-MDS info version of 2 or 3, can trigger an out-of-bounds read in...

CVE-2026-89650

In the Linux kernel, the following vulnerability has been resolved: ceph: bound numexporttargets array for mds info v2/v3 cephmdsmapdecode in fs/ceph/mdsmap.c reads numexporttargets from each per-mds info record and advances the decode cursor by numexporttargets sizeofu32 without first checking...

CVE-2026-89650 ceph: bound num_export_targets array for mds info v2/v3

In the Linux kernel, the following vulnerability has been resolved: ceph: bound numexporttargets array for mds info v2/v3 cephmdsmapdecode in fs/ceph/mdsmap.c reads numexporttargets from each per-mds info record and advances the decode cursor by numexporttargets sizeofu32 without first checking...

CVE-2026-89650

CVE-2026-89650 affects the Linux kernel's CephFS client in fs/ceph/mdsmap.c. The function ceph_mdsmap_decode() reads num_export_targets from per-MDS info records and advances the decode cursor by num_export_targets * sizeof(u32) without verifying that enough bytes remain. The upper-bound check is...