CVE-2026-89646 Linux Kernel Ceph - Broken Access Control

Linux kernel contains a broken access control vulnerability in Ceph where leaked inode references occur on writeback abort during umount, caused by failure to release wrbuffer claims, letting attackers cause inode eviction failure, exploit requires umount operation.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to the latest Linux kernel version containing the fix for leaked inode reference on writeback abort at umount.

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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