CVE-2026-43241

Kernel memory corruption via unchecked MW indexing

Published May 6, 2026 · Updated May 6, 2026

Out-of-bounds write in the Linux Kernel Switchtec NTB driver allows attackers to corrupt kernel memory during driver initialization. In switchtec_ntb_init_shared(), each LUT position is added to nr_direct_mw and used to write mw_sizes[idx] without first rejecting an index at or above MAX_MWS. Reachability requires Switchtec NTB hardware and a configuration whose direct and LUT windows reach the array limit; public sources do not establish that local users control this configuration.

CVSS severity7.1
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the Linux Kernel Switchtec NTB driver allows attackers to corrupt kernel memory during driver initialization. In switchtec_ntb_init_shared(), each LUT position is added to nr_direct_mw and used to write mw_sizes[idx] without first rejecting an index at or above MAX_MWS. Reachability requires Switchtec NTB hardware and a configuration whose direct and LUT windows reach the array limit; public sources do not establish that local users control this configuration.

The record

CVE
CVE-2026-43241
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0e930420945106151c6eb3d7837b4e6154e9b144
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2346856b74823a2a78109002e479a3d02526a9ce
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <348e1ac9ad983ed7e62de14e1daf47f1695a4ce9
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47ce292dd45dc689747c40603222691638919189
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <740945de896021b9a859e71f38f6aea72a6393cf
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <85c9daa1f8319bbb3dfee71dc6a2f969cd3b4c92
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c8ba7ad2cc1c7b90570aa347b8ebbe279f1eface
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ee02c4f980c91820845dd8e469ec7dc670ab6d9d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0e930420945106151c6eb3d7837b4e6154e9b144; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2346856b74823a2a78109002e479a3d02526a9ce; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <348e1ac9ad983ed7e62de14e1daf47f1695a4ce9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47ce292dd45dc689747c40603222691638919189; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <740945de896021b9a859e71f38f6aea72a6393cf; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <85c9daa1f8319bbb3dfee71dc6a2f969cd3b4c92; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c8ba7ad2cc1c7b90570aa347b8ebbe279f1eface; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ee02c4f980c91820845dd8e469ec7dc670ab6d9d

Published CVSS scores

7.0SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N
7.3SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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