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CVE-2026-43141

📛 CVE Title

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

⬇ Download JSON ⚠ View as Threat

Description

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.

Overview

State
PUBLISHED
Assigner (CNA)
Linux
CVSS severity
high
CVSS score
CVSS 7.1 / 10 7.1 7.1 / 10
CVSS vector
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Effective score
7.1 / 10 HIGH source: CNA overview
CWE(s)
—
Reserved
2026-05-01
Published
2026-05-06 13:27 UTC
Last updated
2026-05-12 00:18 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43141.json
Linked Threat
CVE-2026-43141 — CVE-2026-43141

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-05-06 12:16:31 UTC
NVD last modified
2026-05-13 20:52:24 UTC
NVD CVSS v3.1
CVSS 7.1 / 10 7.1 7.1 / 10 HIGH source: nvd@nist.gov
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Exploitability subscore
1.8 / 10
Impact subscore
5.2 / 10
EPSS score
0.0001 (probability of exploitation in next 30 days)
EPSS percentile
2.55% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD-assigned CWE(s): CWE-125 (differs from the CNA list above)

NVD / KEV / EPSS data refreshed 2026-05-25 09:07 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-27702
Assigner
Linux
Published
May 6, 2026, 11:27:26 AM
Updated
May 11, 2026, 10:18:33 PM
EUVD base score
0.0 / 10
EUVD-reported EPSS
0.0100
Vendors
Linux
Products
Linux (patch: 5.10.252)
Linux (patch: 6.6.128)
Linux (1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a133e3caf844a3f56b6eef89ddaa66115874f6bd)
Linux (patch: 5.15.202)
Linux (ec0467ccbdeb69a86c8729073057bda7bce00eec <186615f8855a0be4ee7d3fcd09a8ecc10e783b08)
Linux (1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <186615f8855a0be4ee7d3fcd09a8ecc10e783b08)
Linux (1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2e4d5e8d86a969318340be95470bb76e52392082)
Linux (patch: 6.19.6)
Linux (ec0467ccbdeb69a86c8729073057bda7bce00eec <5590cd04d6845c01a6bad985a491c58af6fb5389)
Linux (ec0467ccbdeb69a86c8729073057bda7bce00eec <a133e3caf844a3f56b6eef89ddaa66115874f6bd)
Linux (4.15)
Linux (patch: 6.1.165)
Linux (ec0467ccbdeb69a86c8729073057bda7bce00eec <2e4d5e8d86a969318340be95470bb76e52392082)
Linux (1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d652ef399f131fcd5f8f34266167449ee7c9e5b3)
Linux (ec0467ccbdeb69a86c8729073057bda7bce00eec <d0559d07afabfddaaded6a61a16154486b956764)
Linux (1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0559d07afabfddaaded6a61a16154486b956764)
Linux (1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1a867d0d79a4a570a33f2f433919ad2bd7a27b67)
Linux (1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5590cd04d6845c01a6bad985a491c58af6fb5389)
Linux (patch: 6.18.16)
Linux (patch: 0)
Linux (patch: 7.0)
Linux (patch: 6.12.75)
Linux (1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a11d03d116eef138a7249202bd772c8e61915aec)
Linux (ec0467ccbdeb69a86c8729073057bda7bce00eec <1a867d0d79a4a570a33f2f433919ad2bd7a27b67)
Linux (ec0467ccbdeb69a86c8729073057bda7bce00eec <a11d03d116eef138a7249202bd772c8e61915aec)
Linux (ec0467ccbdeb69a86c8729073057bda7bce00eec <d652ef399f131fcd5f8f34266167449ee7c9e5b3)

ENISA description: 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.

EUVD references (8)

Affected products (2)
VendorProductVersionsPlatforms
Linux Linux ec0467ccbdeb69a86c8729073057bda7bce00eec (affected), ec0467ccbdeb69a86c8729073057bda7bce00eec (affected), ec0467ccbdeb69a86c8729073057bda7bce00eec (affected), ec0467ccbdeb69a86c8729073057bda7bce00eec (affected), ec0467ccbdeb69a86c8729073057bda7bce00eec (affected), ec0467ccbdeb69a86c8729073057bda7bce00eec (affected), ec0467ccbdeb69a86c8729073057bda7bce00eec (affected), ec0467ccbdeb69a86c8729073057bda7bce00eec (affected) —
Linux Linux 4.15 (affected), 0 (unaffected), 5.10.252 (unaffected), 5.15.202 (unaffected), 6.1.165 (unaffected), 6.6.128 (unaffected), 6.12.75 (unaffected), 6.18.16 (unaffected), 6.19.6 (unaffected), 7.0 (unaffected) —

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Vendor references (8)

References embedded in the original CVE record by the assigning CNA.

MITRE references (8) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

Web references (6)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (8)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (18)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

  • CISA Warns of Exploited Microsoft Defender 0-Day Flaws
    web:cyberpress.org

    The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added two actively exploited Microsoft Defender vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, issuing an urgent remediation directive for federal agencies with a due date of June 3, 2026 .

    2026-05-23 21:12 UTC
  • GitHub - rootsecdev/cve_2026_31431: Exploit POC for CVE_2026_31431 · GitHub
    web:github.com

    Exploit POC for CVE_2026_31431. Contribute to rootsecdev/cve_2026_31431 development by creating an account on GitHub.

    2026-05-23 21:12 UTC
  • Security Update Guide - Microsoft
    web:portal.msrc.microsoft.com

    The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

    2026-05-23 21:12 UTC
  • CISA Adds One Known Exploited Vulnerability to Catalog
    web:www.cisa.gov

    Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog as a living list of known Common Vulnerabilities and ...

    2026-05-23 21:12 UTC
  • April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike
    web:www.crowdstrike.com

    Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

    2026-05-23 21:12 UTC
  • 4 ways to properly mitigate the Log4j vulnerabilities (and 4 to skip)
    web:www.csoonline.com

    A sure-fire way to prevent exploitation of Log4j vulnerabilities has yet to appear, but these actions are your best bet for reducing risk.

    2026-05-23 21:12 UTC
  • Public Assistance Hazard Mitigation - FEMA.gov
    web:www.fema.gov

    Public Assistance hazard mitigation provides funding to protect damaged public infrastructure from future events and helps communities build back better. Hazard mitigation is part of the post-disaster Public Assistance grant; it is not a separate application or grant program.

    2026-05-23 21:12 UTC
  • CVE-2026-31431 Copy Fail Explained: IOCs and Patch Guide
    web:www.kodemsecurity.com

    CVE - 2026 -31431, the Copy Fail Linux kernel LPE, lets authenticated users gain root. See affected kernels, exploit details, IOCs and patches.

    2026-05-23 21:12 UTC
  • Oracle Critical Patch Update Advisory - April 2026
    web:www.oracle.com

    This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

    2026-05-23 21:12 UTC
  • PDF Transportation Security Administration
    web:www.tsa.gov

    Transportation Security Administration

    2026-05-23 21:12 UTC
  • How do I fix CVE-2026-31431 on Ubuntu 24.04 LTS?
    web:askubuntu.com

    9 Update: Kernel 6.8.-117.117 is released now and features a kernel-level fix for CVE - 2026 -31431. While the website may be down, the security email list continues to work apparently and they have emailed about a mitigation there in an email from 30.04. 2026 18:06 CET. The issue should be mitigated for now thanks to USN-8226-1 and USN-8226-2.

    2026-05-26 02:45 UTC
  • How to Patch CVE-2026-31431 (Copy Fail) on AlmaLinux, Rocky Linux ...
    web:linux.how2shout.com

    The CVE - 2026 -31431 patch for Linux is rolling out across distributions right now. If you run AlmaLinux, Rocky Linux, Ubuntu, or Debian on anything that lets untrusted users get a shell, like multi-tenant hosts, container build farms, CI runners, or shared hosting setups, this guide walks you through the fix .

    2026-05-26 02:45 UTC
  • Fixes available for CVE-2026-31431 (Copy Fail) Linux Kernel Local ...
    web:ubuntu.com

    A local privilege escalation (LPE) vulnerability affecting the Linux kernel has been publicly disclosed on April 29, 2026 . The vulnerability has been assigned CVE ID CVE - 2026 -31431 and is referred to as Copy Fail. The affected component is a kernel module that provides hardware-accelerated cryptographic functions: algif_aead. The vulnerab […]

    2026-05-26 02:45 UTC
  • CISA KEV: Linux "Copy Fail" CVE-2026-31431 Turns Kernel Bug Into Patch ...
    web:windowsforum.com

    CISA added CVE - 2026 -31431, a Linux kernel local privilege escalation flaw known as "Copy Fail," to its Known Exploited Vulnerabilities Catalog on May 1, 2026 , after evidence of active exploitation, triggering mandatory remediation for U.S. federal civilian agencies under BOD 22-01. The move...

    2026-05-26 02:45 UTC
  • Linux faces its largest security threat in years—here's how to deal ...
    web:www.howtogeek.com

    Here's the list of mitigation solutions available as we go to publication: Ubuntu Red Hat Enterprise Linux SUSE The Red Hat team warns that there may be a "performance impact" for any task that requires Linux kernel cryptograpic features, so you might notice the effects until a patch lets you restore the relevant processes.

    2026-05-26 02:45 UTC
  • Proof-of-concept exploit available for Linux 'Copy Fail ... - Sophos
    web:www.sophos.com

    On April 29, 2026 , details about the ' Copy Fail ' vulnerability ( CVE - 2026 -31431) were publicly disclosed. This high-severity (CVSS score of 7.8) privilege escalation vulnerability impacts Linux distributions shipped since 2017. It allows an unprivileged local user to obtain root-level access on affected Linux systems by corrupting the kernel's in-memory page cache of a privileged binary ...

    2026-05-26 02:45 UTC
  • CISA Warning: High-Severity Linux Flaw Puts Unpatched Systems at Risk
    web:www.techrepublic.com

    CISA warns that the nine-year-old Linux Copy Fail flaw is being actively exploited, allowing local attackers to gain root access on affected systems.

    2026-05-26 02:45 UTC
  • Severe Linux Copy Fail security flaw uncovered using AI scanning help
    web:www.theverge.com

    The CVE - 2026 -31431 "Copy Fail" exploit affects nearly all recent Linux distributions, giving attackers with any level of access a way to grant themselves admin privileges without leaving a trail.

    2026-05-26 02:45 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-43141.json.

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntb: ntb_hw_switchtec: Fix shift-out-of-bounds for 0 mw lut\n\nNumber of MW LUTs depends on NTB configuration and can be set to zero,\nin such scenario rounddown_pow_of_two will cause undefined behaviour and\nshould not be performed.\nThis patch ensures that rounddown_pow_of_two is called on valid value."
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    "cveId": "CVE-2026-43141",
    "datePublished": "2026-05-06T11:27:26.193Z",
    "dateReserved": "2026-05-01T14:12:55.989Z",
    "dateUpdated": "2026-05-11T22:18:33.118Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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