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NVD / CVE Program· CNA Linux

CVE-2026-43141: ntb: ntb_hw_switchtec: Fix shift-out-of-bounds for 0 mw lut

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.13% (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 186615f8855a0be4ee7d3fcd09a8ecc10e783b08, 1a867d0d79a4a570a33f2f433919ad2bd7a27b67, 2e4d5e8d86a969318340be95470bb76e52392082.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 186615f8855a0be4ee7d3fcd09a8ecc10e783b08, 1a867d0d79a4a570a33f2f433919ad2bd7a27b67, 2e4d5e8d86a969318340be95470bb76e52392082 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: ntb: ntb_hw_switchtec: Fix shift-out-of-bounds for 0 mw lut Number of MW LUTs depends on NTB configuration and can be set to zero, in such scenario rounddown_pow_of_two will cause undefined behaviour and should not be performed. This patch ensures that rounddown_pow_of_two is called on valid value.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
May 6, 2026
Updated
Jun 17, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 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-2026-43141

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 kernel4.15 and later · before 5.10.252
  • linux linux kernel5.11 and later · before 5.15.202
  • linux linux kernel5.16 and later · before 6.1.165
  • linux linux kernel6.2 and later · before 6.6.128
  • linux linux kernel6.7 and later · before 6.12.75
  • linux linux kernel6.13 and later · before 6.18.16
  • linux linux kernel6.19 and later · before 6.19.6

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

    • 4.15affected
    • ec0467ccbdeb69a86c8729073057bda7bce00eec and later · before d652ef399f131fcd5f8f34266167449ee7c9e5b3affected · git
    • ec0467ccbdeb69a86c8729073057bda7bce00eec and later · before 5590cd04d6845c01a6bad985a491c58af6fb5389affected · git
    • ec0467ccbdeb69a86c8729073057bda7bce00eec and later · before a11d03d116eef138a7249202bd772c8e61915aecaffected · git
    • ec0467ccbdeb69a86c8729073057bda7bce00eec and later · before d0559d07afabfddaaded6a61a16154486b956764affected · git
    • ec0467ccbdeb69a86c8729073057bda7bce00eec and later · before 2e4d5e8d86a969318340be95470bb76e52392082affected · git
    • ec0467ccbdeb69a86c8729073057bda7bce00eec and later · before a133e3caf844a3f56b6eef89ddaa66115874f6bdaffected · git
    • ec0467ccbdeb69a86c8729073057bda7bce00eec and later · before 1a867d0d79a4a570a33f2f433919ad2bd7a27b67affected · git
    • ec0467ccbdeb69a86c8729073057bda7bce00eec and later · before 186615f8855a0be4ee7d3fcd09a8ecc10e783b08affected · git
    • before 4.15not 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 6.19.6-16.19.6-1

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-2026-43121May 6, 2026 · io_uring/zcrx: fix user_ref race between scrub and refill paths
    18Monitor
  • ← EarlierCVE-2026-43138May 6, 2026 · reset: gpio: suppress bind attributes in sysfs
    31Monitor
  • Later →CVE-2026-43142May 6, 2026 · media: iris: gen1: Destroy internal buffers after FW releases
    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 Linux186615f8855a0be4ee7d3fcd09a8ecc10e783b08Vendor (CNA)
Linux Linux1a867d0d79a4a570a33f2f433919ad2bd7a27b67Vendor (CNA)
Linux Linux2e4d5e8d86a969318340be95470bb76e52392082Vendor (CNA)
Linux Linux5590cd04d6845c01a6bad985a491c58af6fb5389Vendor (CNA)
Linux Linuxa11d03d116eef138a7249202bd772c8e61915aecVendor (CNA)
Linux Linuxa133e3caf844a3f56b6eef89ddaa66115874f6bdVendor (CNA)
Linux Linuxd0559d07afabfddaaded6a61a16154486b956764Vendor (CNA)
Linux Linuxd652ef399f131fcd5f8f34266167449ee7c9e5b3Vendor (CNA)
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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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
high · data can be read
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
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

ATT&CK techniques

—

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