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CVE-2026-43427

📛 CVE Title

usb: class: cdc-wdm: fix reordering issue in read code path

⬇ Download JSON ⚠ View as Threat

Description

In the Linux kernel, the following vulnerability has been resolved: usb: class: cdc-wdm: fix reordering issue in read code path Quoting the bug report: Due to compiler optimization or CPU out-of-order execution, the desc->length update can be reordered before the memmove. If this happens, wdm_read() can see the new length and call copy_to_user() on uninitialized memory. This also violates LKMM data race rules [1]. Fix it by using WRITE_ONCE and memory barriers.

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
2026-05-08 16:22 UTC
Last updated
2026-05-12 00:24 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43427.json
Linked Threat
CVE-2026-43427 — CVE-2026-43427

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
2026-05-08 15:16:54 UTC
NVD last modified
2026-05-20 18:29:41 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
2.51% 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 08:54 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-2026-28733
Assigner
Linux
Published
May 8, 2026, 2:22:00 PM
Updated
May 11, 2026, 10:24:22 PM
EUVD base score
0.0 / 10
EUVD-reported EPSS
0.1300
Vendors
Linux
Products
Linux (afba937e540c902c989cd516fd97ea0c8499bb27 <4ee3062bf2c9a722afef429826e8607eaf3fc6a0)
Linux (patch: 6.6.130)
Linux (patch: 5.10.253)
Linux (patch: 6.19.9)
Linux (patch: 0)
Linux (afba937e540c902c989cd516fd97ea0c8499bb27 <170e8daca24da6edb4be82ab01abf44e87af387b)
Linux (afba937e540c902c989cd516fd97ea0c8499bb27 <8df672bfe3ec2268c2636584202755898e547173)
Linux (afba937e540c902c989cd516fd97ea0c8499bb27 <c8fa96ed021923dae147bcd9f9205b8df7b82360)
Linux (afba937e540c902c989cd516fd97ea0c8499bb27 <67ed312124bb1b61858778ac0b985b48961c862a)
Linux (afba937e540c902c989cd516fd97ea0c8499bb27 <276aef0fd2b92f41b920ac891c72cadeee957934)
Linux (patch: 5.15.203)
Linux (2.6.26)
Linux (afba937e540c902c989cd516fd97ea0c8499bb27 <638328ca9c17ae6511ad62198c57bae32ffa3c91)
Linux (patch: 6.1.167)
Linux (patch: 6.12.78)
Linux (patch: 7.0)
Linux (afba937e540c902c989cd516fd97ea0c8499bb27 <e3c874b05901dc519054b5107d16620e6d2b5fea)
Linux (patch: 6.18.19)

ENISA description: In the Linux kernel, the following vulnerability has been resolved: usb: class: cdc-wdm: fix reordering issue in read code path Quoting the bug report: Due to compiler optimization or CPU out-of-order execution, the desc->length update can be reordered before the memmove. If this happens, wdm_read() can see the new length and call copy_to_user() on uninitialized memory. This also violates LKMM data race rules [1]. Fix it by using WRITE_ONCE and memory barriers.

EUVD references (8)

Affected products (2)
VendorProductVersionsPlatforms
Linux Linux afba937e540c902c989cd516fd97ea0c8499bb27 (affected), afba937e540c902c989cd516fd97ea0c8499bb27 (affected), afba937e540c902c989cd516fd97ea0c8499bb27 (affected), afba937e540c902c989cd516fd97ea0c8499bb27 (affected), afba937e540c902c989cd516fd97ea0c8499bb27 (affected), afba937e540c902c989cd516fd97ea0c8499bb27 (affected), afba937e540c902c989cd516fd97ea0c8499bb27 (affected), afba937e540c902c989cd516fd97ea0c8499bb27 (affected) —
Linux Linux 2.6.26 (affected), 0 (unaffected), 5.10.253 (unaffected), 5.15.203 (unaffected), 6.1.167 (unaffected), 6.6.130 (unaffected), 6.12.78 (unaffected), 6.18.19 (unaffected), 6.19.9 (unaffected), 7.0 (unaffected) —

Affected products — CPE 2.3 (15) 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:*:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:2.6.26:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:2.6.26:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:2.6.26:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:2.6.26:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:2.6.26:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:2.6.26:rc8:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:2.6.26:rc9:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*

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 (19)

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 21:05 UTC
  • Oracle Critical Patch Update (CPU) April 2026 for Oracle Java SE
    web:docs.oracle.com

    Oracle Critical Patch Update (CPU) April 2026 for Oracle Java SE Services: Java Management Release Date: April 21, 2026

    2026-05-23 21:05 UTC
  • Patch Tuesday, May 2026 Edition - Krebs on Security
    web:krebsonsecurity.com

    Microsoft expects that exploitation is more likely. May's Patch Tuesday is a welcome respite from April, which saw Microsoft fix a near-record 167 security flaws.

    2026-05-23 21:05 UTC
  • Oracle CPU April 2026: Delayed RUs & First Analysis
    web:oradba.ch

    19c 26ai cve oracle-cpu patch -management release-update security Oracle CPU April 2026 : Delayed RUs & First Analysis On April 21, 2026 , Oracle released the Critical Patch Update (CPU) for April 2026 — 481 new security fixes across the entire Oracle product stack. For Oracle Database, this means another round of mandatory patching.

    2026-05-23 21:05 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 21:05 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 21:05 UTC
  • Oracle Critical Patch Update (CPU) for 2026 Fixes 337 ... - LinkedIn
    web:www.linkedin.com

    Oracle has released its January 2026 Critical Patch Update (CPU), a wide-ranging security bulletin that addresses 337 newly identified vulnerabilities across a broad spectrum of its enterprise ...

    2026-05-23 21:05 UTC
  • Oracle April 2026 Critical Patch Update 241 CVEs | Tenable®
    web:www.tenable.com

    Oracle addresses 241 CVEs in its April Critical Patch Update, the second quarterly update of 2026 with 481 patches, including 34 critical updates.

    2026-05-23 21:05 UTC
  • CVE-2026-43427 - High Vulnerability - TheHackerWire
    web:www.thehackerwire.com

    To protect against CVE-2026-43427 , you should: (1) Apply the latest security patches from Linux, (2) Check official security advisories for specific remediation steps, (3) Update affected software to the latest version, and (4) Monitor your systems for any signs of exploitation.

    2026-05-23 21:05 UTC
  • Windows 11 April 2026 Update tested: What's new, improved and fixed
    web:www.windowslatest.com

    Windows 11 April 2026 update adds Narrator Copilot support, faster Settings, File Explorer fixes, and key security improvements.

    2026-05-23 21:05 UTC
  • Microsoft and Adobe Patch Tuesday, April 2026 Security Update Review
    web:blog.qualys.com

    With Qualys Policy Audit's out-of-the-box mitigation or Compensatory Controls, which reduce the risk of a vulnerability being exploited because the remediation ( fix / patch ) cannot be done immediately, these security controls are not recommended by any industry standards, such as CIS and DISA-STIG.

    2026-05-26 02:49 UTC
  • CVE‑2026‑44277: Critical FortiAuthenticator API Access Control Flaw ...
    web:integsec.com

    CVE‑2026‑44277 is a critical‑severity vulnerability in Fortinet's FortiAuthenticator identity‑and‑access‑management platform that allows an unauthenticated attacker to execute arbitrary code or commands on the appliance. This single vulnerability can put your corporate identity store, authentication flows, and downstream business systems into an attacker's hands, making it a ...

    2026-05-26 02:49 UTC
  • Patch Tuesday, April 2026 Edition - Krebs on Security
    web:krebsonsecurity.com

    For a clickable, per- patch breakdown, check out the SANS Internet Storm Center Patch Tuesday roundup. Running into problems applying any of these updates?

    2026-05-26 02:49 UTC
  • March 13, 2026—Hotpatch KB5084597 (OS Builds 26200.7982 and 26100.7982 ...
    web:support.microsoft.com

    This update for Windows 11, version 25H2 and 24H2 (KB5084597) incudes security improvements. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update terminology, see the different types of Windows software updates. To view the ...

    2026-05-26 02:49 UTC
  • Microsoft April 2026 Patch Tuesday fixes 167 flaws, 2 zero-days
    web:www.bleepingcomputer.com

    Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.

    2026-05-26 02:49 UTC
  • A guide to vulnerability remediation vs mitigation | @Bugcrowd
    web:www.bugcrowd.com

    Vulnerability mitigation is typically considered a temporary or interim solution. While mitigation measures can reduce the immediate risk associated with vulnerabilities, they may not provide a permanent fix . Organizations should aim to prioritize and plan for complete vulnerability remediation whenever feasible and allocate resources accordingly.

    2026-05-26 02:49 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.

    2026-05-26 02:49 UTC
  • Vulnerability Remediation vs. Mitigation: What are the Differences ...
    web:www.secure.com

    Learn the difference between vulnerability remediation and mitigation , and how a risk-based strategy can strengthen your security posture.

    2026-05-26 02:49 UTC
  • Patch Tuesday May 2026: Security Updates & CVE Analysis
    web:zecurit.com

    Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

    2026-05-26 02:49 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-43427.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/class/cdc-wdm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "638328ca9c17ae6511ad62198c57bae32ffa3c91",
              "status": "affected",
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              "versionType": "git"
            },
            {
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.26"
            },
            {
              "lessThan": "2.6.26",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.19.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.253",
                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.9",
                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: class: cdc-wdm: fix reordering issue in read code path\n\nQuoting the bug report:\n\nDue to compiler optimization or CPU out-of-order execution, the\ndesc->length update can be reordered before the memmove. If this\nhappens, wdm_read() can see the new length and call copy_to_user() on\nuninitialized memory. This also violates LKMM data race rules [1].\n\nFix it by using WRITE_ONCE and memory barriers."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:24:22.781Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91"
        },
        {
          "url": "https://git.kernel.org/stable/c/170e8daca24da6edb4be82ab01abf44e87af387b"
        },
        {
          "url": "https://git.kernel.org/stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360"
        },
        {
          "url": "https://git.kernel.org/stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/276aef0fd2b92f41b920ac891c72cadeee957934"
        },
        {
          "url": "https://git.kernel.org/stable/c/67ed312124bb1b61858778ac0b985b48961c862a"
        },
        {
          "url": "https://git.kernel.org/stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea"
        },
        {
          "url": "https://git.kernel.org/stable/c/8df672bfe3ec2268c2636584202755898e547173"
        }
      ],
      "title": "usb: class: cdc-wdm: fix reordering issue in read code path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43427",
    "datePublished": "2026-05-08T14:22:00.345Z",
    "dateReserved": "2026-05-01T14:12:56.009Z",
    "dateUpdated": "2026-05-11T22:24:22.781Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}