CVE-2026-89968 Linux Kernel nvmet-tcp - Denial of Service

Linux kernel nvmet-tcp contains a denial of service caused by accepting unsolicited H2CData PDUs without verifying R2T transmission, letting remote attackers cause kernel BUG or soft-lockup, exploit requires no authentication on allow_any_host subsystem.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.82% 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:N/I:N/A:H
Published
16 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for unsolicited H2CData PDU rejection.

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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