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NVD / CVE Program· CNA Linux

CVE-2026-43103: net: lapbether: handle NETDEV_PRE_TYPE_CHANGE

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 328bb2cff5c2ed973f595ded769e15f4b7a117be, 363a38044b8cd5b496d241651a1fb666e7c5fe3e, 63851f60781aa89258c8f0952cd13940aab0888e.

Low priority for now. Upgrade to Linux Linux 328bb2cff5c2ed973f595ded769e15f4b7a117be, 363a38044b8cd5b496d241651a1fb666e7c5fe3e, 63851f60781aa89258c8f0952cd13940aab0888e 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: net: lapbether: handle NETDEV_PRE_TYPE_CHANGE lapbeth_data_transmit() expects the underlying device type to be ARPHRD_ETHER. Returning NOTIFY_BAD from lapbeth_device_event() makes sure bonding driver can not break this expectation.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 6, 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-2026-43103

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 kernel2.6.24 and later · before 6.6.136
  • linux linux kernel6.7 and later · before 6.12.83
  • linux linux kernel6.13 and later · before 6.18.24
  • linux linux kernel6.19 and later · before 6.19.14
  • 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

    • 2.6.24affected
    • 872254dd6b1f80cb95ee9e2e22980888533fc293 and later · before 698642a01d53107ce9b3fc08bd801284af478a2baffected · git
    • 872254dd6b1f80cb95ee9e2e22980888533fc293 and later · before ffc5ed59f6dc87c51e8775f002619310225742e8affected · git
    • 872254dd6b1f80cb95ee9e2e22980888533fc293 and later · before a10570973619cba9dfa6d723177251b846fae587affected · git
    • 872254dd6b1f80cb95ee9e2e22980888533fc293 and later · before 363a38044b8cd5b496d241651a1fb666e7c5fe3eaffected · git
    • 872254dd6b1f80cb95ee9e2e22980888533fc293 and later · before 328bb2cff5c2ed973f595ded769e15f4b7a117beaffected · git
    • 872254dd6b1f80cb95ee9e2e22980888533fc293 and later · before 63851f60781aa89258c8f0952cd13940aab0888eaffected · git
    • 872254dd6b1f80cb95ee9e2e22980888533fc293 and later · before b117056768ab7deb434e7d72065e48d2083a0c2aaffected · git
    • 872254dd6b1f80cb95ee9e2e22980888533fc293 and later · before b120e4432f9f56c7103133d6a11245e617695adbaffected · git
    • before 2.6.24not 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 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.14-16.19.14-1

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-2026-43100May 6, 2026 · bridge: guard local VLAN-0 FDB helpers against NULL vlan group
    22Monitor
  • ← EarlierCVE-2026-43102May 6, 2026 · net: airoha: Fix memory leak in airoha_qdma_rx_process()
    22Monitor
  • Later →CVE-2026-43104May 6, 2026 · drm/vc4: Fix a memory leak in hang state error path
    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 Linux328bb2cff5c2ed973f595ded769e15f4b7a117beVendor (CNA)
Linux Linux363a38044b8cd5b496d241651a1fb666e7c5fe3eVendor (CNA)
Linux Linux63851f60781aa89258c8f0952cd13940aab0888eVendor (CNA)
Linux Linux698642a01d53107ce9b3fc08bd801284af478a2bVendor (CNA)
Linux Linuxa10570973619cba9dfa6d723177251b846fae587Vendor (CNA)
Linux Linuxb117056768ab7deb434e7d72065e48d2083a0c2aVendor (CNA)
Linux Linuxb120e4432f9f56c7103133d6a11245e617695adbVendor (CNA)
Linux Linuxffc5ed59f6dc87c51e8775f002619310225742e8Vendor (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.

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