CVE-2026-45871

TPM service interruption via unreleased locality

Published May 27, 2026 · Updated May 27, 2026

Improper cleanup in the Linux Kernel st33zp24 TPM driver interrupts TPM access after an I2C or SPI communication timeout. The st33zp24_send() error path returns when get_burstcount() reports -EBUSY but fails to relinquish the TPM locality acquired earlier, leaving it unavailable for later operations. The condition requires a hardware communication timeout that cannot be invoked or influenced from userspace, so the resulting impact is limited to TPM availability.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper cleanup in the Linux Kernel st33zp24 TPM driver interrupts TPM access after an I2C or SPI communication timeout. The st33zp24_send() error path returns when get_burstcount() reports -EBUSY but fails to relinquish the TPM locality acquired earlier, leaving it unavailable for later operations. The condition requires a hardware communication timeout that cannot be invoked or influenced from userspace, so the resulting impact is limited to TPM availability.

The record

CVE
CVE-2026-45871
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.1
  2. Affected versionversion=bf38b8710892333cec2d8069644eb36ff435fd6f <1256c6dc96d1e687e6e9b63088156ed07411b00c
  3. Affected versionversion=bf38b8710892333cec2d8069644eb36ff435fd6f <3e91b44c93ad2871f89fc2a98c5e4fe6ca5db3d9
  4. Affected versionversion=bf38b8710892333cec2d8069644eb36ff435fd6f <4fffb77d35d038f146e6192da583dbe4971d869e
  5. Affected versionversion=bf38b8710892333cec2d8069644eb36ff435fd6f <7687133509cf66ced120b667fefd21f80bf17993
  6. Affected versionversion=bf38b8710892333cec2d8069644eb36ff435fd6f <a51cff9be046e13e1c1b2fe45d5c48b582ec9b8c
  7. Affected versionversion=bf38b8710892333cec2d8069644eb36ff435fd6f <cc09d55f519e15355de343264a22ac6682b8305e
  8. Affected versionversion=bf38b8710892333cec2d8069644eb36ff435fd6f <e0ce3da82341fcd6194175f1837946b2a894c625
  9. Affected versionversion=bf38b8710892333cec2d8069644eb36ff435fd6f <ec15eb67fe9df87981b4829b901ec254273ca483

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.1; version=bf38b8710892333cec2d8069644eb36ff435fd6f <1256c6dc96d1e687e6e9b63088156ed07411b00c; version=bf38b8710892333cec2d8069644eb36ff435fd6f <3e91b44c93ad2871f89fc2a98c5e4fe6ca5db3d9; version=bf38b8710892333cec2d8069644eb36ff435fd6f <4fffb77d35d038f146e6192da583dbe4971d869e; version=bf38b8710892333cec2d8069644eb36ff435fd6f <7687133509cf66ced120b667fefd21f80bf17993; version=bf38b8710892333cec2d8069644eb36ff435fd6f <a51cff9be046e13e1c1b2fe45d5c48b582ec9b8c; version=bf38b8710892333cec2d8069644eb36ff435fd6f <cc09d55f519e15355de343264a22ac6682b8305e; version=bf38b8710892333cec2d8069644eb36ff435fd6f <e0ce3da82341fcd6194175f1837946b2a894c625; version=bf38b8710892333cec2d8069644eb36ff435fd6f <ec15eb67fe9df87981b4829b901ec254273ca483

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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