CVE-2026-89652 Linux kernel Ceph - Buffer Overflow

Linux kernel Ceph contains a buffer overflow caused by unchecked dname_len in ceph_get_name and __get_snap_name functions, letting malicious or compromised Ceph MDS cause out-of-bounds write, exploit requires CephFS mount re-exported over NFS.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.46% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to a Linux kernel version that includes ceph_export_copy_name() with length checks or latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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