CVE-2026-68340

Out-of-bounds read via truncated OCC response

Published Aug 10, 2026 · Updated Aug 10, 2026

Out-of-bounds read in the Linux kernel OCC hwmon parser allows context-dependent attackers to parse beyond a truncated poll response. The parser bounds counted sensor blocks by static array capacity rather than transport data_length, so it consumes headers or extents outside the current response. Reachability requires an OCC on POWER8 or POWER9 to return truncated data; the bounded consequence is malformed sensor metadata, with no write or code execution established.

CVSS severity2.3
Low
EPSS probability0.15%
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 kernel OCC hwmon parser allows context-dependent attackers to parse beyond a truncated poll response. The parser bounds counted sensor blocks by static array capacity rather than transport data_length, so it consumes headers or extents outside the current response. Reachability requires an OCC on POWER8 or POWER9 to return truncated data; the bounded consequence is malformed sensor metadata, with no write or code execution established.

The record

CVE
CVE-2026-68340
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=aa195fe49b033db545ad986cdb2c431c37bea557 <112525534ab5cff482d35897ca4ca11fd3a76f46
  3. Affected versionversion=aa195fe49b033db545ad986cdb2c431c37bea557 <538d862cc0dbd5c732fe26d5aad98eae039e6676
  4. Affected versionversion=aa195fe49b033db545ad986cdb2c431c37bea557 <54cb78eceb4e286ccd5a5c01a4632157860d47f0
  5. Affected versionversion=aa195fe49b033db545ad986cdb2c431c37bea557 <70e76e700fc6c46afb4e17aec099a1ea089b4a22
  6. Affected versionversion=aa195fe49b033db545ad986cdb2c431c37bea557 <b042e538e98b939fccfffc464e2c34c29f0e96ef

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.0; version=aa195fe49b033db545ad986cdb2c431c37bea557 <112525534ab5cff482d35897ca4ca11fd3a76f46; version=aa195fe49b033db545ad986cdb2c431c37bea557 <538d862cc0dbd5c732fe26d5aad98eae039e6676; version=aa195fe49b033db545ad986cdb2c431c37bea557 <54cb78eceb4e286ccd5a5c01a4632157860d47f0; version=aa195fe49b033db545ad986cdb2c431c37bea557 <70e76e700fc6c46afb4e17aec099a1ea089b4a22; version=aa195fe49b033db545ad986cdb2c431c37bea557 <b042e538e98b939fccfffc464e2c34c29f0e96ef

Published CVSS scores

2.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
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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