CVE-2026-99083 Linux kernel ksmbd - Out of Bounds Write

Linux kernel ksmbd contains a heap out-of-bounds write caused by incorrect buffer length calculation in krb5_authenticate() during SMB2_SESSION_SETUP processing, letting attackers write past buffer boundaries, exploit requires crafted SMB2 compound requests.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.21% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out of Bounds Write
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
23 October 2026
Updated
25 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix.

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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