---
id: CVE-2026-90070
title: |-
  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
summary: |-
  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 t…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 251a7b08213af82e40e4a70cac056e245853c410 <
    d732cfc4befe28f02ec82ed5fd2bc2a21fbabd42
  - >-
    Linux >= 251a7b08213af82e40e4a70cac056e245853c410 <
    4973e8386257eed10e5433a94a53bcc6ec37d2a1
  - >-
    Linux >= 251a7b08213af82e40e4a70cac056e245853c410 <
    981307e2e8a930da492c2bcf763865c47c2a5165
  - >-
    Linux >= 251a7b08213af82e40e4a70cac056e245853c410 <
    1bfd5c54e40704ce93d128a25de3d8dd772bf183
  - >-
    Linux >= 251a7b08213af82e40e4a70cac056e245853c410 <
    38c26fe4522963a91d4fb02c844d8faa740fe9d1
  - >-
    Linux >= 251a7b08213af82e40e4a70cac056e245853c410 <
    14feaa498c20c1b7ddefe27de5329aaff822cc0d
  - >-
    Linux >= 251a7b08213af82e40e4a70cac056e245853c410 <
    e6d7d9b665419cda3e9f91030d81c9f8ba71e51d
  - >-
    Linux >= 251a7b08213af82e40e4a70cac056e245853c410 <
    8b92687708f5ef980de01c2042dbd76d11f78547
  - Linux 3.9
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:16:55.940'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90070'
references:
  - url: 'https://git.kernel.org/stable/c/14feaa498c20c1b7ddefe27de5329aaff822cc0d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1bfd5c54e40704ce93d128a25de3d8dd772bf183'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/38c26fe4522963a91d4fb02c844d8faa740fe9d1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4973e8386257eed10e5433a94a53bcc6ec37d2a1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8b92687708f5ef980de01c2042dbd76d11f78547'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/981307e2e8a930da492c2bcf763865c47c2a5165'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d732cfc4befe28f02ec82ed5fd2bc2a21fbabd42'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e6d7d9b665419cda3e9f91030d81c9f8ba71e51d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.899Z'
epss: 0.0022
epssPercentile: 0.11037
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.