CVE-2026-89657 Linux Kernel libceph - Denial of Service

Linux kernel libceph contains a denial of service caused by improper validation of OSD extent maps in osd_sparse_read(), letting malicious authenticated Ceph OSD peers crash kernel Ceph clients via malformed sparse-read replies, exploit requires authenticated malicious OSD peer.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.61% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to the latest Linux kernel version containing the fix for sparse extent map validation.

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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