CVE-2026-89652High· 7.0▾ TwilightA flaw was found in the Linux kernel's Ceph file system. A malicious or compromised Ceph Metadata Server (MDS) can send a specially crafted `LOOKUPNAME` reply that causes a buffer overflow when copying dentry names during an NFS export ope…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 38.5 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 7.4
none → high
— → 7.4
none → high
— → 9.8
none → critical
0.2% → 0.5%
9.8 → 7.4
critical → high
7.4 → 9.8
high → critical
Last analysed / modified upstream
9.8 → 7
critical → high
A flaw was found in the Linux kernel's Ceph file system. A malicious or compromised Ceph Metadata Server (MDS) can send a specially crafted LOOKUPNAME reply that causes a buffer overflow when copying dentry names during an NFS export operation. This out-of-bounds write can lead to memory corruption on the client system, particularly when a CephFS mount is re-exported over NFS.
kernel: ceph: bound copied dentry name length in NFS export get_name — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-18.
Affected:
No fix planned:
Not affected:
Affected
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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