CVE-2026-90070

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

tpm: st33zp24: Return zero on status read failure

st33zp24_status() ignores the result of the transport read and returns

data even when no byte was received. The I2C transport, for example,

skips i2c_master_recv() when the register-select write is short or fails,

leaving data uninitialized. The resulting stack value can be interpreted

as TPM_STS flags and let status checks complete spuriously.

The status callback cannot propagate a transport error. Return zero

unless recv() reports exactly one byte. With no status bits set, callers

retry or take their existing timeout or error path instead of acting on

an invalid status value.

This issue was found by a static analysis checker and confirmed by manual

source review.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References