BlackTreeIndependent security intelligence
← Back to the CVE catalogue
Full vulnerability report · 2026
CVE-2026-68340High confidence

hwmon: occ: validate poll response sensor blocks

Linux · Linux

7.7HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

20 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Ubuntu releaseSource packageVendor stateFixed versionEvidence
Ubuntu 24.04 LTSnoble · standard archivelinuxAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-awsAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-azureAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-azure-fdeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-azure-nvidiaAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-gcpAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-gkeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-gkeopAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-ibmAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-lowlatencyAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-nvidiaAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-nvidia-lowlatencyAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-nvidia-tegraAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-oem-6.11Affected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-oracleAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-raspiAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-raspi-realtimeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-realtimeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-riscvAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-xilinxAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical record ↗Source updated 4 Sept 2026
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-55441

No EUVD known-exploited evidence

In the Linux kernel, the following vulnerability has been resolved: hwmon: occ: validate poll response sensor blocks The OCC poll response parser walks a counted list of sensor data blocks. It used the static backing-array capacity as the parse boundary, but a transport response makes only data_length bytes current and valid. A truncated response can therefore make the parser consume a block header or block extent outside the current response. Use data_length as the parent boundary, prove the fixed poll header and each current block header before reading them, and prove the complete block before advancing. Keep parsed sensor metadata local until the complete response has passed validation, then publish it. Propagate malformed-response errors before publishing the OCC as active.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
7.7 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

In the Linux kernel, the following vulnerability has been resolved: hwmon: occ: validate poll response sensor blocks The OCC poll response parser walks a counted list of sensor data blocks. It used the static backing-array capacity as the parse boundary, but a transport response makes only data_length bytes current and valid. A truncated response can therefore make the parser consume a block header or block extent outside the current response. Use data_length as the parent boundary, prove the fixed poll header and each current block header before reading them, and prove the complete block before advancing. Keep parsed sensor metadata local until the complete response has passed validation, then publish it. Propagate malformed-response errors before publishing the OCC as active.

What

In the Linux kernel, the following vulnerability has been resolved: hwmon: occ: validate poll response sensor blocks The OCC poll response parser walks a counted list of sensor data blocks. It used the static backing-array capacity as the parse boundary, but a transport response makes only data_length bytes current and valid. A truncated response can therefore make the parser consume a block header or block extent outside the current response. Use data_length as the parent boundary, prove the fixed poll header and each current block header before reading them, and prove the complete block before advancing. Keep parsed sensor metadata local until the complete response has passed validation, then publish it. Propagate malformed-response errors before publishing the OCC as active.

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

In the Linux kernel, the following vulnerability has been resolved: hwmon: occ: validate poll response sensor blocks The OCC poll response parser walks a counted list of sensor data blocks. It used the static backing-array capacity as the parse boundary, but a transport response makes only data_length bytes current and valid. A truncated response can therefore make the parser consume a block header or block extent outside the current response. Use data_length as the parent boundary, prove the fixed poll header and each current block header before reading them, and prove the complete block before advancing. Keep parsed sensor metadata local until the complete response has passed validation, then publish it. Propagate malformed-response errors before publishing the OCC as active.

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → vulnerable operation → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration.
CWE not yet assigned
CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
Unauthenticated
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-55441Official EUVD mapping

In the Linux kernel, the following vulnerability has been resolved: hwmon: occ: validate poll response sensor blocks The OCC poll response parser walks a counted list of sensor data blocks. It used the static backing-array capacity as the parse boundary, but a transport response makes only data_length bytes current and valid. A truncated response can therefore make the parser consume a block header or block extent outside the current response. Use data_length as the parent boundary, prove the fixed poll header and each current block header before reading them, and prove the complete block before advancing. Keep parsed sensor metadata local until the complete response has passed validation, then publish it. Propagate malformed-response errors before publishing the OCC as active.

Official EUVD record
BSI · German · WID-SEC-W-2026-2730Linux Kernel: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen, darunter möglicherweise die Ausführung von beliebigem Code, die Ausweitung von Berechtigungen, die Offenlegung von Informationen, die Manipulation von Daten oder Denial-of-Service-Zustände.

Official advisory
CERT-FR · French · CERTFR-2026-AVI-1069Multiples vulnérabilités dans le noyau Linux de Debian LTS

d?id=CVE-2026-68327 Référence CVE CVE-2026-68328 https://www.cve.org/CVERecord?id=CVE-2026-68328 Référence CVE CVE-2026-68329 https://www.cve.org/CVERecord?id=CVE-2026-68329 Référence CVE CVE-2026-68331 https://www.cve.org/CVERecord?id=CVE-2026-68331 Référence CVE CVE-2026-68333 https://www.cve.org/CVERecord?id=CVE-2026-68333 Référence CVE CVE-2026-68335 https://www.cve.org/CVERecord?id=CVE-2026-68335 Référence CVE CVE-2026-68336 https://www.cve.org/CVERecord?id=CVE-2026-68336 Référence CVE CVE-2026-68338 https://www.cve.org/CVERecord?id=CVE-2026-68338 Référence CVE CVE-2026-68339 https://www.cve.org/CVERecord?id=CVE-2026-68339 Référence CVE CVE-2026-68340 https://www.cve.org/CVERecord?id=CVE-2026-68340 Référence CVE CVE-2026-68343 https://www.cve.org/CVERecord?id=CVE-2026-68343 Référence CVE CVE-2026-68344 https://www.cve.org/CVERecord?id=CVE-2026-68344 Référence CVE CVE-2026-68346 https://www.cve.org/CVERecord?id=CVE-2026-68346 Référence CVE CVE-2026-68348 https://www.cve.org/CVERecord?id=CVE-2026-68348 Référence CVE CVE-2026-68349 https://www.cve.org/CVERecord?id=CVE-2026-68349 Référence CVE CVE-2026-68350 https://www.cve.org/CVERecord?id=CVE-2026-68350 Référence CVE CVE-2026-68351 https://www.cve.org/CVERecord?id=CVE-2026-68351 Référence CVE CVE-2026-68352 https://www.cve.org/CVERecord?id=

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
aa195fe49b033db545ad986cdb2c431c37bea557 < 6e6c72c37433640514db325408bd6913ad28fe69; aa195fe49b033db545ad986cdb2c431c37bea557 < 1902e9572901d37901e3db1f3f6b0885f4e49a66; aa195fe49b033db545ad986cdb2c431c37bea557 < 112525534ab5cff482d35897ca4ca11fd3a76f46; aa195fe49b033db545ad986cdb2c431c37bea557 < 54cb78eceb4e286ccd5a5c01a4632157860d47f0; aa195fe49b033db545ad986cdb2c431c37bea557 < 538d862cc0dbd5c732fe26d5aad98eae039e6676; aa195fe49b033db545ad986cdb2c431c37bea557 < b042e538e98b939fccfffc464e2c34c29f0e96ef; aa195fe49b033db545ad986cdb2c431c37bea557 < 70e76e700fc6c46afb4e17aec099a1ea089b4a22; 5.0
Fixed
< 5.0; 5.15.216 ≤ 5.15.*; 6.1.183 ≤ 6.1.*; 6.6.148 ≤ 6.6.*; 6.12.101 ≤ 6.12.*; 6.18.42 ≤ 6.18.*; 7.1.6 ≤ 7.1.*; 7.2 ≤ *
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 10 Aug 2026 · Last source change 19 Aug 2026, 16:33 UTC · CWE not yet assigned

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-55441
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceUnavailable
NVD statusNVD received

Missing structured fields: CWE classification. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates →
  1. Vendor guidanceAuthoritative vendor guidance changed from authoritative remediation link to authoritative remediation link.
    Before
    authoritative remediation link
    After
    authoritative remediation link
    CNA ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    aa195fe49b033db545ad986cdb2c431c37bea557 < 112525534ab5cff482d35897ca4ca11fd3a76f46; aa195fe49b033db545ad986cdb2c431c37bea557 < 54cb78eceb4e286ccd5a5c01a4632157860d47f0; aa195fe49b033db545ad986cdb2c431c37bea557 < 538d862cc0dbd5c732fe26d5aad98eae039e6676; aa195fe49b033db545ad986cdb2c431c37bea557 < b042e538e98b939fccfffc464e2c34c29f0e96ef; aa195fe49b033db545ad986cdb2c431c37bea557 < 70e76e700fc6c46afb4e17aec099a1ea089b4a22; 5.0 · Fixed: < 5.0; 6.6.148 ≤ 6.6.*; 6.12.101 ≤ 6.12.*; 6.18.42 ≤ 6.18.*; 7.1.6 ≤ 7.1.*; 7.2 ≤ *
    After
    aa195fe49b033db545ad986cdb2c431c37bea557 < 6e6c72c37433640514db325408bd6913ad28fe69; aa195fe49b033db545ad986cdb2c431c37bea557 < 1902e9572901d37901e3db1f3f6b0885f4e49a66; aa195fe49b033db545ad986cdb2c431c37bea557 < 112525534ab5cff482d35897ca4ca11fd3a76f46; aa195fe49b033db545ad986cdb2c431c37bea557 < 54cb78eceb4e286ccd5a5c01a4632157860d47f0; aa195fe49b033db545ad986cdb2c431c37bea557 < 538d862cc0dbd5c732fe26d5aad98eae039e6676; aa195fe49b033db545ad986cdb2c431c37bea557 < b042e538e98b939fccfffc464e2c34c29f0e96ef; aa195fe49b033db545ad986cdb2c431c37bea557 < 70e76e700fc6c46afb4e17aec099a1ea089b4a22; 5.0 · Fixed: < 5.0; 5.15.216 ≤ 5.15.*; 6.1.183 ≤ 6.1.*; 6.6.148 ≤ 6.6.*; 6.12.101 ≤ 6.12.*; 6.18.42 ≤ 6.18.*; 7.1.6 ≤ 7.1.*; 7.2 ≤ *
    CNA ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    aa195fe49b033db545ad986cdb2c431c37bea557 < 112525534ab5cff482d35897ca4ca11fd3a76f46; aa195fe49b033db545ad986cdb2c431c37bea557 < 54cb78eceb4e286ccd5a5c01a4632157860d47f0; aa195fe49b033db545ad986cdb2c431c37bea557 < 538d862cc0dbd5c732fe26d5aad98eae039e6676; aa195fe49b033db545ad986cdb2c431c37bea557 < b042e538e98b939fccfffc464e2c34c29f0e96ef; aa195fe49b033db545ad986cdb2c431c37bea557 < 70e76e700fc6c46afb4e17aec099a1ea089b4a22; 5.0 · Fixed: < 5.0; 6.6.148 ≤ 6.6.*; 6.12.101 ≤ 6.12.*; 6.18.42 ≤ 6.18.*; 7.1.6 ≤ 7.1.*; 7.2-rc5 ≤ *
    After
    aa195fe49b033db545ad986cdb2c431c37bea557 < 112525534ab5cff482d35897ca4ca11fd3a76f46; aa195fe49b033db545ad986cdb2c431c37bea557 < 54cb78eceb4e286ccd5a5c01a4632157860d47f0; aa195fe49b033db545ad986cdb2c431c37bea557 < 538d862cc0dbd5c732fe26d5aad98eae039e6676; aa195fe49b033db545ad986cdb2c431c37bea557 < b042e538e98b939fccfffc464e2c34c29f0e96ef; aa195fe49b033db545ad986cdb2c431c37bea557 < 70e76e700fc6c46afb4e17aec099a1ea089b4a22; 5.0 · Fixed: < 5.0; 6.6.148 ≤ 6.6.*; 6.12.101 ≤ 6.12.*; 6.18.42 ≤ 6.18.*; 7.1.6 ≤ 7.1.*; 7.2 ≤ *
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-55441↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-68340 · cve.blacktree.nl