CVE-2026-90174 Linux kernel ksmbd - Out-of-Bounds Read

Linux kernel ksmbd contains a slab-out-of-bounds read caused by unchecked resp->hash_sz in ksmbd_alloc_user(), letting attackers trigger out-of-bounds memory read, exploit requires a malformed or malicious mountd IPC login response.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.16% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out-of-Bounds Read
Impact
Information Disclosure, Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Published
17 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for ksmbd slab-out-of-bounds read.

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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