CVE-2026-72135

Local heap disclosure and corruption via TPM pread

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds access in Linux TPM character devices allows local users to disclose heap memory or corrupt it through positional I/O. tpm_common_read() uses an unchecked pread offset to form data_buffer + *off, after which copy_to_user() reads beyond the heap buffer and memset() can zero memory beyond it. Access to a TPM character device and a pending command response are required; a successful out-of-bounds write can corrupt kernel memory or crash the system.

CVSS severity8.4
High
EPSS probability0.17%
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 access in Linux TPM character devices allows local users to disclose heap memory or corrupt it through positional I/O. tpm_common_read() uses an unchecked pread offset to form data_buffer + *off, after which copy_to_user() reads beyond the heap buffer and memset() can zero memory beyond it. Access to a TPM character device and a pending command response are required; a successful out-of-bounds write can corrupt kernel memory or crash the system.

The record

CVE
CVE-2026-72135
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-823, CAPEC-129
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=5.0
  2. Affected versionversion=9488585b21bef0df1217e510c7134905d1d376a7 <21a13f932972bc9836f58c44fcd47c62abdecd95
  3. Affected versionversion=9488585b21bef0df1217e510c7134905d1d376a7 <232dcf908eb7eb9d8046a9597975caf44270966e
  4. Affected versionversion=9488585b21bef0df1217e510c7134905d1d376a7 <947b773caaa548672184df025271b29bdc80b0f1
  5. Affected versionversion=9488585b21bef0df1217e510c7134905d1d376a7 <9c513dabd4540f811585a2087f23069767a284da
  6. Affected versionversion=9488585b21bef0df1217e510c7134905d1d376a7 <ada4b9a5087ea7f30dd8e4c6411a4fb6547eb1ed
  7. Affected versionversion=9488585b21bef0df1217e510c7134905d1d376a7 <dda695fab5e21f923d29e8cb01df256468ddfbd1
  8. Affected versionversion=9488585b21bef0df1217e510c7134905d1d376a7 <ed0ffc2c016629e40ba041ed0424a772d8b02e2c
  9. Affected versionversion=9488585b21bef0df1217e510c7134905d1d376a7 <f20d61c22bcaf172d6790b6500e3838e532e71c8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.0; version=9488585b21bef0df1217e510c7134905d1d376a7 <21a13f932972bc9836f58c44fcd47c62abdecd95; version=9488585b21bef0df1217e510c7134905d1d376a7 <232dcf908eb7eb9d8046a9597975caf44270966e; version=9488585b21bef0df1217e510c7134905d1d376a7 <947b773caaa548672184df025271b29bdc80b0f1; version=9488585b21bef0df1217e510c7134905d1d376a7 <9c513dabd4540f811585a2087f23069767a284da; version=9488585b21bef0df1217e510c7134905d1d376a7 <ada4b9a5087ea7f30dd8e4c6411a4fb6547eb1ed; version=9488585b21bef0df1217e510c7134905d1d376a7 <dda695fab5e21f923d29e8cb01df256468ddfbd1; version=9488585b21bef0df1217e510c7134905d1d376a7 <ed0ffc2c016629e40ba041ed0424a772d8b02e2c; version=9488585b21bef0df1217e510c7134905d1d376a7 <f20d61c22bcaf172d6790b6500e3838e532e71c8

Published CVSS scores

8.4CanonicalCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CanonicalCVSS: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.

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-823Use of Out-of-range Pointer Offset
CAPEC-129Pointer Manipulation

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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