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CVE-2026-68340· NVD / CVE Program· CNA Linux

hwmon: occ: validate poll response sensor blocks

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.

HighCVSS 7.7 · v3.1—No exploit Fix available
Published
Aug 10, 2026
Updated
Aug 19, 2026
EPSS
0.2% · 8th percentile
CWE
—
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Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CNA vs NVD score

NVD
—
CNA · Linux
7.7
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

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Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.0affected
    • aa195fe49b033db545ad986cdb2c431c37bea557 and later · before 6e6c72c37433640514db325408bd6913ad28fe69affected · git
    • aa195fe49b033db545ad986cdb2c431c37bea557 and later · before 1902e9572901d37901e3db1f3f6b0885f4e49a66affected · git
    • aa195fe49b033db545ad986cdb2c431c37bea557 and later · before 112525534ab5cff482d35897ca4ca11fd3a76f46affected · git
    • aa195fe49b033db545ad986cdb2c431c37bea557 and later · before 54cb78eceb4e286ccd5a5c01a4632157860d47f0affected · git
    • aa195fe49b033db545ad986cdb2c431c37bea557 and later · before 538d862cc0dbd5c732fe26d5aad98eae039e6676affected · git
    • aa195fe49b033db545ad986cdb2c431c37bea557 and later · before b042e538e98b939fccfffc464e2c34c29f0e96efaffected · git
    • aa195fe49b033db545ad986cdb2c431c37bea557 and later · before 70e76e700fc6c46afb4e17aec099a1ea089b4a22affected · git
    • before 5.0not affected · semver
    • 5.15.216 and later · up to and including 5.15.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.101-1~deb12u16.12.101-1~deb12u1
Debian:13linuxbefore 6.12.101-16.12.101-1
Debian:14linuxbefore 7.1.6-17.1.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

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  • CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
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    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux112525534ab5cff482d35897ca4ca11fd3a76f46Vendor (CNA)
Linux Linux1902e9572901d37901e3db1f3f6b0885f4e49a66Vendor (CNA)
Linux Linux538d862cc0dbd5c732fe26d5aad98eae039e6676Vendor (CNA)
Linux Linux54cb78eceb4e286ccd5a5c01a4632157860d47f0Vendor (CNA)
Linux Linux6e6c72c37433640514db325408bd6913ad28fe69Vendor (CNA)
Linux Linux70e76e700fc6c46afb4e17aec099a1ea089b4a22Vendor (CNA)
Linux Linuxb042e538e98b939fccfffc464e2c34c29f0e96efVendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

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CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

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Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records