CVE-2026-43141

Kernel disclosure and interruption via zero LUT

Published May 6, 2026 · Updated May 6, 2026

Out-of-bounds shifting in the Switchtec NTB driver in Linux Kernel allows local users to disclose kernel data or interrupt service. The driver passes a zero memory-window LUT count to rounddown_pow_of_two(), which performs an invalid shift instead of skipping the rounding operation. Reachability requires a Switchtec NTB configuration reporting zero memory-window LUTs and local low-privileged access; the published impact is limited to disclosure and service interruption.

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 shifting in the Switchtec NTB driver in Linux Kernel allows local users to disclose kernel data or interrupt service. The driver passes a zero memory-window LUT count to rounddown_pow_of_two(), which performs an invalid shift instead of skipping the rounding operation. Reachability requires a Switchtec NTB configuration reporting zero memory-window LUTs and local low-privileged access; the published impact is limited to disclosure and service interruption.

The record

CVE
CVE-2026-43141
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499.004
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 <186615f8855a0be4ee7d3fcd09a8ecc10e783b08
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1a867d0d79a4a570a33f2f433919ad2bd7a27b67
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2e4d5e8d86a969318340be95470bb76e52392082
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5590cd04d6845c01a6bad985a491c58af6fb5389
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a11d03d116eef138a7249202bd772c8e61915aec
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a133e3caf844a3f56b6eef89ddaa66115874f6bd
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0559d07afabfddaaded6a61a16154486b956764
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d652ef399f131fcd5f8f34266167449ee7c9e5b3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <186615f8855a0be4ee7d3fcd09a8ecc10e783b08; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1a867d0d79a4a570a33f2f433919ad2bd7a27b67; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2e4d5e8d86a969318340be95470bb76e52392082; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5590cd04d6845c01a6bad985a491c58af6fb5389; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a11d03d116eef138a7249202bd772c8e61915aec; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a133e3caf844a3f56b6eef89ddaa66115874f6bd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0559d07afabfddaaded6a61a16154486b956764; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d652ef399f131fcd5f8f34266167449ee7c9e5b3

Published CVSS scores

7.1NIST NVDCVSS: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
T1499.004Application or System Exploitation

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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