CVE-2026-90042 Linux kernel Ceph - Denial of Service

Linux kernel contains a memory handling vulnerability in Ceph where vmalloc() buffers are improperly decrypted in fscrypt subsystem, causing kernel oops on non-x86 platforms, exploit requires crafted Ceph messages in vmalloc buffers.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.50% 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:H/I:H/A:H
Published
16 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for proper decryption of vmalloc buffers in Ceph.

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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