CVE-2026-89653High· 8.1▾ TwilightA flaw was found in the Linux kernel's Ceph filesystem. This vulnerability occurs when a malicious or malformed MDSMap export_targets entry, controlled by a monitor, contains a rank value that exceeds the maximum allowed (CEPH_MAX_MDS) dur…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 44.6 · 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%
— → 7.5
— → 7.5
none → high
— → 9.8
none → critical
9.8 → 7.5
critical → high
7.5 → 9.8
high → critical
0.2% → 0.5%
Last analysed / modified upstream
9.8 → 7
critical → high
7 → 8.1
A flaw was found in the Linux kernel's Ceph filesystem. This vulnerability occurs when a malicious or malformed MDSMap export_targets entry, controlled by a monitor, contains a rank value that exceeds the maximum allowed (CEPH_MAX_MDS) during the decoding process. This can lead to an out-of-bounds write, where the system attempts to write data beyond its designated memory area. Such an issue could result in a denial of service (DoS), making the system unresponsive or unstable.
kernel: ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-16.
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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