CVE-2026-79976 MCTP - Denial of Service

The MCTP-over-I2C+GPIO target binding in subsys/pmci/mctp/mctp_i2c_gpio_target.c contains a denial of service caused by stale register and data-phase flags not being cleared on I2C STOP, letting any controller on the bus cause device reset or halt, exploit requires controller access on the shared management bus.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Published
21 October 2026
Updated
22 October 2026
Weakness
CWE-476

Vendor fix

Update to a version where b->reg_addr and b->rxtx are reset at every I2C STOP, or apply the patch that clears these flags.

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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