CVE-2026-89649 Linux kernel CephFS - Information Disclosure

Linux kernel CephFS contains an information disclosure vulnerability caused by missing bounds check on the last xattr value length in __build_xattrs(), letting a malicious metadata server disclose adjacent kernel heap bytes to local users via getxattr(2), exploit requires local user access.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.68% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Information Disclosure
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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 this vulnerability.

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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