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NVD / CVE Program· CNA Linux

CVE-2026-64087: hwmon: (pmbus/adm1266) reject implausible blackbox record_count

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 0e791cd0140fb136083565aadfbe0f705aa260d0, 231db52a5b64d0a9769e298dadc148e1f79b26a6, 4afca954622d672ea65ed961bed01cf91caa034e.

Low priority for now. Upgrade to Linux Linux 0e791cd0140fb136083565aadfbe0f705aa260d0, 231db52a5b64d0a9769e298dadc148e1f79b26a6, 4afca954622d672ea65ed961bed01cf91caa034e or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) reject implausible blackbox record_count adm1266_nvmem_read_blackbox() loops over a record_count that comes straight from byte 3 of the BLACKBOX_INFO response. The destination buffer is data->dev_mem, sized for the nvmem cell's declared 2048 bytes (ADM1266_BLACKBOX_MAX_RECORDS * ADM1266_BLACKBOX_SIZE = 32 * 64). A device that reports a record_count greater than 32 -- whether due to firmware bugs, bus corruption, or a non-responsive slave returning 0xff -- would walk read_buff past the end of the dev_mem allocation on the trailing iterations. Cap record_count at ADM1266_BLACKBOX_MAX_RECORDS (introduced here) before entering the loop and return -EIO on any larger value, so a malformed BLACKBOX_INFO response cannot drive the loop out of bounds.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jul 19, 2026
Updated
Sep 3, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.10 and later · before 5.10.258
  • linux linux kernel5.11 and later · before 5.15.209
  • linux linux kernel5.16 and later · before 6.1.175
  • linux linux kernel6.2 and later · before 6.6.142
  • linux linux kernel6.7 and later · before 6.12.92
  • linux linux kernel6.13 and later · before 6.18.34
  • linux linux kernel6.19 and later · before 7.0.11
  • linux linux kernel7.1

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

    • 5.10affected
    • 15609d1893020436e1e8ccfd9ded774a96dd17a2 and later · before adcb163ad7cacca317872fc62bd8885e842e45e3affected · git
    • 15609d1893020436e1e8ccfd9ded774a96dd17a2 and later · before c2c56092710fe8a893b67b5a3d7e62808d02d84daffected · git
    • 15609d1893020436e1e8ccfd9ded774a96dd17a2 and later · before 5469e1e7c411acc15fdd8262c99c3ebd9defd594affected · git
    • 15609d1893020436e1e8ccfd9ded774a96dd17a2 and later · before f85c81e93dbd6915970bd5f3bffcf62633c4c54caffected · git
    • 15609d1893020436e1e8ccfd9ded774a96dd17a2 and later · before 0e791cd0140fb136083565aadfbe0f705aa260d0affected · git
    • 15609d1893020436e1e8ccfd9ded774a96dd17a2 and later · before 75c862adf3d3caab4f49bb3530723c215376e37caffected · git
    • 15609d1893020436e1e8ccfd9ded774a96dd17a2 and later · before 231db52a5b64d0a9769e298dadc148e1f79b26a6affected · git
    • 15609d1893020436e1e8ccfd9ded774a96dd17a2 and later · before 4afca954622d672ea65ed961bed01cf91caa034eaffected · git
    • before 5.10not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.12-17.0.12-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-64085Jul 19, 2026 · hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer
    31Monitor
  • ← EarlierCVE-2026-64086Jul 19, 2026 · hwmon: (pmbus/adm1266) include PEC byte in pmbus_block_xfer read buffer
    31Monitor
  • Later →CVE-2026-64088Jul 19, 2026 · batman-adv: tt: fix negative tt_buff_len
    35Monitor

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 Linux0e791cd0140fb136083565aadfbe0f705aa260d0Vendor (CNA)
Linux Linux231db52a5b64d0a9769e298dadc148e1f79b26a6Vendor (CNA)
Linux Linux4afca954622d672ea65ed961bed01cf91caa034eVendor (CNA)
Linux Linux5469e1e7c411acc15fdd8262c99c3ebd9defd594Vendor (CNA)
Linux Linux75c862adf3d3caab4f49bb3530723c215376e37cVendor (CNA)
Linux Linuxadcb163ad7cacca317872fc62bd8885e842e45e3Vendor (CNA)
Linux Linuxc2c56092710fe8a893b67b5a3d7e62808d02d84dVendor (CNA)
Linux Linuxf85c81e93dbd6915970bd5f3bffcf62633c4c54cVendor (CNA)
debian:linux6.1.176-1 · 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.

—

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.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

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.

Change log

  1. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records