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CVE-2026-43089

📛 CVE Title

xfrm_user: fix info leak in build_mapping()

⬇ Download JSON ⚠ View as Threat

Description

In the Linux kernel, the following vulnerability has been resolved: xfrm_user: fix info leak in build_mapping() struct xfrm_usersa_id has a one-byte padding hole after the proto field, which ends up never getting set to zero before copying out to userspace. Fix that up by zeroing out the whole structure before setting individual variables.

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 09:40 UTC
Last updated
2026-05-12 00:17 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43089.json
Linked Threat
CVE-2026-43089 — CVE-2026-43089

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 10:16:22 UTC
NVD last modified
2026-05-06 13:08:07 UTC
EPSS score
0.0002 (probability of exploitation in next 30 days)
EPSS percentile
6.96% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD / KEV / EPSS data refreshed 2026-05-25 09:08 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-2026-27589
Assigner
Linux
Published
May 6, 2026, 7:40:22 AM
Updated
May 11, 2026, 10:17:30 PM
EUVD base score
0.0 / 10
EUVD-reported EPSS
0.0100
Vendors
Linux
Products
Linux (3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 <f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c)
Linux (patch: 6.12.83)
Linux (3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 <1beb76b2053b68c491b78370794b8ff63c8f8c02)
Linux (patch: 0)
Linux (3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 <d3125c541a96fb3c0fc7210112684baf22b6c24d)
Linux (3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 <5a1a4b049ddde41466ccac0daeec326254b133f2)
Linux (2.6.29)
Linux (patch: 6.18.24)
Linux (3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 <700c9622b23c33b5933e6dcea816492c064e4e10)
Linux (patch: 6.6.136)
Linux (patch: 7.0)
Linux (patch: 6.19.14)

ENISA description: In the Linux kernel, the following vulnerability has been resolved: xfrm_user: fix info leak in build_mapping() struct xfrm_usersa_id has a one-byte padding hole after the proto field, which ends up never getting set to zero before copying out to userspace. Fix that up by zeroing out the whole structure before setting individual variables.

EUVD references (5)

Affected products (2)
VendorProductVersionsPlatforms
Linux Linux 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 (affected), 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 (affected), 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 (affected), 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 (affected), 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 (affected) —
Linux Linux 2.6.29 (affected), 0 (unaffected), 6.6.136 (unaffected), 6.12.83 (unaffected), 6.18.24 (unaffected), 6.19.14 (unaffected), 7.0 (unaffected) —

Vendor references (5)

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

MITRE references (5) 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 (5)

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 (20)

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 21:13 UTC
  • Microsoft Patch Tuesday March 2026 - 78 Vulnerabilities Fixed ...
    web:cybersecuritynews.com

    Microsoft released its March 2026 Patch Tuesday security update on March 10, 2026 , addressing 78 vulnerabilities across Windows, Microsoft Office, Azure, SQL Server, and .NET. The update includes one actively exploited zero-day vulnerability and multiple Critical-rated flaws demanding immediate attention from security teams. The most urgent fix this month is CVE - 2026 -21262, the sole zero-day ...

    2026-05-23 21:13 UTC
  • Nvd - Cve-2024-43089
    web:nvd.nist.gov

    Official websites use .gov A .gov website belongs to an official government organization in the United States.

    2026-05-23 21:13 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 21:13 UTC
  • Microsoft Patches Two Actively Exploited Defender Zero-Days on Windows
    web:windowsreport.com

    Microsoft patched two actively exploited Defender zero-days affecting Windows systems and security components.

    2026-05-23 21:13 UTC
  • Microsoft warns of new Defender zero-days exploited in attacks
    web:www.bleepingcomputer.com

    On Wednesday, Microsoft started rolling out security patches for two Defender vulnerabilities that have been exploited in zero-day attacks.

    2026-05-23 21:13 UTC
  • 2 New Microsoft Defender Zero-Days Exploited—Patch Now ... - Forbes
    web:www.forbes.com

    Microsoft has confirmed an emergency security update as CISA warns that two new Defender zero-days are being exploited by attackers.

    2026-05-23 21:13 UTC
  • Emergency patch issued for Microsoft Office, 365 over hacking threat - MSN
    web:www.msn.com

    Original story: Microsoft has released an emergency patch for a vulnerability in the company's Office programs that's already being exploited by hackers.

    2026-05-23 21:13 UTC
  • Microsoft confirms two major Defender security issues — so update now ...
    web:www.techradar.com

    CISA confirms two bugs being actively exploited in the wild, as Microsoft releases patches.

    2026-05-23 21:13 UTC
  • Microsoft Issues Massive Windows Patch for 160+ Bugs ... - TechRepublic
    web:www.techrepublic.com

    Microsoft's April 2026 Patch Tuesday fixes 165 vulnerabilities, including two zero-days, in one of the company's largest monthly security updates.

    2026-05-23 21:13 UTC
  • Critical Windows Netlogon RCE Vulnerability Exploited in Attacks
    web:aviatrix.ai

    CVE - 2026 -41089, a critical Windows Netlogon vulnerability, is actively exploited, posing significant risks to unpatched Windows Server systems.

    2026-06-03 07:49 UTC
  • CVE-2026-41089 Netlogon RCE: Patch Domain Controllers
    web:blog.gridinsoft.com

    CVE - 2026 -41089 in Windows Netlogon is now reported as actively exploited. Patch domain controllers and check LSASS, Netlogon, and authentication logs.

    2026-06-03 07:49 UTC
  • CVE-2026-41089 Exploited: Windows Netlogon RCE Under Active Attack
    web:dailysecurityreview.com

    Belgium's CCB confirmed active exploitation of CVE - 2026 -41089, a CVSS 9.8 unauthenticated Windows Netlogon RCE affecting all supported Windows Server versions.

    2026-06-03 07:49 UTC
  • Windows Netlogon stack buffer overflow - Kudelski Security Research Center
    web:kudelskisecurity.com

    Immediate Patching: Apply the May 2026 Patch Tuesday security update from Microsoft to all affected Windows Server versions. This is the only complete mitigation for CVE - 2026 -41089.

    2026-06-03 07:49 UTC
  • Security Update Guide - Microsoft
    web:msrc.microsoft.com

    The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

    2026-06-03 07:49 UTC
  • NVD - Home
    web:nvd.nist.gov

    The NVD is the U.S. government repository of standards based vulnerability management data represented using the Security Content Automation Protocol (SCAP). This data enables automation of vulnerability management, security measurement, and compliance. The NVD includes databases of security checklist references, security-related software flaws, product names, and impact metrics. For ...

    2026-06-03 07:49 UTC
  • Netlogon RCE CVE-2026-41089 Flaw | Orca Security
    web:orca.security

    Critical Netlogon RCE CVE - 2026 -41089 puts Windows Server domain controllers at risk. Use Orca Security to detect unpatched instances and protect your AD.

    2026-06-03 07:49 UTC
  • CVE-2026-41089: Windows Netlogon Critical RCE — Detection and ...
    web:securityarsenal.com

    A critical CVSS 9.8 flaw in Windows Netlogon allows SYSTEM-level code execution on Domain Controllers. Immediate patching is required.

    2026-06-03 07:49 UTC
  • CVE-2026-41089 Netlogon RCE: Why Windows Domain Controllers Must Patch ...
    web:windowsforum.com

    CVE - 2026 -41089 is a Microsoft-disclosed Windows Netlogon remote code execution vulnerability published in the Security Update Guide on May 12, 2026 , affecting the authentication plumbing Windows domains use to establish trusted communication between domain-joined machines and domain controllers...

    2026-06-03 07:49 UTC
  • Critical Windows Netlogon Bug CVE-2026-41089 Now Exploited in the Wild
    web:windowsreport.com

    Belgium's cybersecurity agency warns attackers are actively exploiting the critical Windows Netlogon vulnerability CVE - 2026 -41089.

    2026-06-03 07:49 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-43089.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/xfrm_user.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d3125c541a96fb3c0fc7210112684baf22b6c24d",
              "status": "affected",
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              "versionType": "git"
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            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "700c9622b23c33b5933e6dcea816492c064e4e10",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "1beb76b2053b68c491b78370794b8ff63c8f8c02",
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          ]
        },
        {
          "defaultStatus": "affected",
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          "programFiles": [
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.29"
            },
            {
              "lessThan": "2.6.29",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.136",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
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                },
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                },
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                },
                {
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                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm_user: fix info leak in build_mapping()\n\nstruct xfrm_usersa_id has a one-byte padding hole after the proto\nfield, which ends up never getting set to zero before copying out to\nuserspace.  Fix that up by zeroing out the whole structure before\nsetting individual variables."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:17:30.710Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d3125c541a96fb3c0fc7210112684baf22b6c24d"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a1a4b049ddde41466ccac0daeec326254b133f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c"
        },
        {
          "url": "https://git.kernel.org/stable/c/700c9622b23c33b5933e6dcea816492c064e4e10"
        },
        {
          "url": "https://git.kernel.org/stable/c/1beb76b2053b68c491b78370794b8ff63c8f8c02"
        }
      ],
      "title": "xfrm_user: fix info leak in build_mapping()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43089",
    "datePublished": "2026-05-06T07:40:22.630Z",
    "dateReserved": "2026-05-01T14:12:55.984Z",
    "dateUpdated": "2026-05-11T22:17:30.710Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}