CVE-2024-36477

Kernel buffer over-read via omitted TPM SPI header

Published Jun 21, 2024 · Updated Aug 5, 2026

Out-of-bounds read in the Linux TPM SPI driver allows local users to read past a kernel transfer buffer during TPM communication. The buffer is sized to MAX_SPI_FRAMESIZE even though the driver prepends a four-byte header, so a maximum-size frame crosses the allocation boundary. Reachability requires local low-privileged access and a TPM attached over SPI; KASAN confirmed the boundary violation.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux TPM SPI driver allows local users to read past a kernel transfer buffer during TPM communication. The buffer is sized to MAX_SPI_FRAMESIZE even though the driver prepends a four-byte header, so a maximum-size frame crosses the allocation boundary. Reachability requires local low-privileged access and a TPM attached over SPI; KASAN confirmed the boundary violation.

The record

CVE
CVE-2024-36477
Published
Jun 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.6
  2. Affected versionversion=a86a42ac2bd652fdc7836a9d880c306a2485c142 <1547183852dcdfcc25878db7dd3620509217b0cd
  3. Affected versionversion=a86a42ac2bd652fdc7836a9d880c306a2485c142 <195aba96b854dd664768f382cd1db375d8181f88
  4. Affected versionversion=a86a42ac2bd652fdc7836a9d880c306a2485c142 <de13c56f99477b56980c7e00b09c776d16b7563d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=a86a42ac2bd652fdc7836a9d880c306a2485c142 <1547183852dcdfcc25878db7dd3620509217b0cd; version=a86a42ac2bd652fdc7836a9d880c306a2485c142 <195aba96b854dd664768f382cd1db375d8181f88; version=a86a42ac2bd652fdc7836a9d880c306a2485c142 <de13c56f99477b56980c7e00b09c776d16b7563d

Published CVSS scores

4.4OracleCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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