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NVD / CVE Program· CNA Linux

CVE-2026-23307: can: ems_usb: ems_usb_read_bulk_callback(): check the proper length of a message

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 1818974e1b5ef200e27f144c8cb8a246420bb54d, 18f75b9cbdc3703f15965425ab69dee509b07785, 1cf469026d4a2308eaa91d04dca4a900d07a5c2e; azl3 kernel 6.6.126.1-1 on Azure Linux 3.0 6.6.130.1-1.

Low priority for now. Upgrade to Linux Linux 1818974e1b5ef200e27f144c8cb8a246420bb54d, 18f75b9cbdc3703f15965425ab69dee509b07785, 1cf469026d4a2308eaa91d04dca4a900d07a5c2e; azl3 kernel 6.6.126.1-1 on Azure Linux 3.0 6.6.130.1-1 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: can: ems_usb: ems_usb_read_bulk_callback(): check the proper length of a message When looking at the data in a USB urb, the actual_length is the size of the buffer passed to the driver, not the transfer_buffer_length which is set by the driver as the max size of the buffer. When parsing the messages in ems_usb_read_bulk_callback() properly check the size both at the beginning of parsing the message to make sure it is big enough for the expected structure, and at the end of the message to make sure we don't overflow past the end of the buffer for the next message.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Mar 25, 2026
Updated
Jun 17, 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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-23307

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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 kernel2.6.32 and later · before 5.10.253
  • linux linux kernel5.11 and later · before 5.15.203
  • linux linux kernel5.16 and later · before 6.1.167
  • linux linux kernel6.2 and later · before 6.6.130
  • linux linux kernel6.7 and later · before 6.12.77
  • linux linux kernel6.13 and later · before 6.18.17
  • linux linux kernel6.19 and later · before 6.19.7
  • linux linux kernel7.0

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

    • 2.6.32affected
    • 702171adeed3607ee9603ec30ce081411e36ae42 and later · before aed172a2e2330131f0977d2acd3ec8883f413ec1affected · git
    • 702171adeed3607ee9603ec30ce081411e36ae42 and later · before f10177e6c4575aedaea580ce67d792fab7a2235eaffected · git
    • 702171adeed3607ee9603ec30ce081411e36ae42 and later · before c703bbf8e9b4947e111c88d2ed09236a6772a471affected · git
    • 702171adeed3607ee9603ec30ce081411e36ae42 and later · before 1818974e1b5ef200e27f144c8cb8a246420bb54daffected · git
    • 702171adeed3607ee9603ec30ce081411e36ae42 and later · before 18f75b9cbdc3703f15965425ab69dee509b07785affected · git
    • 702171adeed3607ee9603ec30ce081411e36ae42 and later · before 1cf469026d4a2308eaa91d04dca4a900d07a5c2eaffected · git
    • 702171adeed3607ee9603ec30ce081411e36ae42 and later · before 2833e13e2b099546abf5d40a483b4eb04ddd1f7baffected · git
    • 702171adeed3607ee9603ec30ce081411e36ae42 and later · before 38a01c9700b0dcafe97dfa9dc7531bf4a245deffaffected · git
    • before 2.6.32not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.8-16.19.8-1

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-2026-23305Mar 25, 2026 · accel/rocket: fix unwinding in error path in rocket_probe
    28Monitor
  • ← EarlierCVE-2026-23306Mar 25, 2026 · scsi: pm8001: Fix use-after-free in pm8001_queue_command()
    31Monitor
  • Later →CVE-2026-23308Mar 25, 2026 · pinctrl: equilibrium: fix warning trace on load
    22Monitor

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 Linux1818974e1b5ef200e27f144c8cb8a246420bb54dVendor (CNA)
Linux Linux18f75b9cbdc3703f15965425ab69dee509b07785Vendor (CNA)
Linux Linux1cf469026d4a2308eaa91d04dca4a900d07a5c2eVendor (CNA)
Linux Linux2833e13e2b099546abf5d40a483b4eb04ddd1f7bVendor (CNA)
Linux Linux38a01c9700b0dcafe97dfa9dc7531bf4a245deffVendor (CNA)
Linux Linuxaed172a2e2330131f0977d2acd3ec8883f413ec1Vendor (CNA)
Linux Linuxc703bbf8e9b4947e111c88d2ed09236a6772a471Vendor (CNA)
Linux Linuxf10177e6c4575aedaea580ce67d792fab7a2235eVendor (CNA)
azl3 kernel 6.6.126.1-1 on Azure Linux 3.06.6.130.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.170-1 · 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.

No history yet (it accumulates with the daily EPSS job).

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