CVE-2026-43380

Description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read The q54sj108a2_debugfs_read function suffers from a stack buffer overflow due to incorrect arguments passed to bin2hex(). The function currently passes 'data' as the destination and 'data_char' as the source. Because bin2hex() converts each input byte into two hex characters, a 32-byte block read results in 64 bytes of output. Since 'data' is only 34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end of the buffer onto the stack. Additionally, the arguments were swapped: it was reading from the zero-initialized 'data_char' and writing to 'data', resulting in all-zero output regardless of the actual I2C read. Fix this by: 1. Expanding 'data_char' to 66 bytes to safely hold the hex output. 2. Correcting the bin2hex() argument order and using the actual read count. 3. Using a pointer to select the correct output buffer for the final simple_read_from_buffer call.

Overview

State: PUBLISHED
Assigner (CNA): Linux
CVSS severity: high
CVSS score: 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 16:21 UTC
Last updated: 2026-05-12 00:23 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43380.json
Linked Threat: CVE-2026-43380 — CVE-2026-43380

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 15:16:49 UTC
NVD last modified: 2026-05-20 17:16:22 UTC
NVD CVSS v3.1: 7.8 / 10 HIGH source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 1.8 / 10
Impact subscore: 5.9 / 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)

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-2026-28686
Assigner: Linux
Published: May 8, 2026, 2:21:28 PM
Updated: May 20, 2026, 4:08:07 PM
EUVD base score (CVSS 3.1): 7.8 / 10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EUVD-reported EPSS: 0.0100
Vendors: Linux
Products: Linux (d014538aa38561cd24c5eb228223585f26c5ec71 <24a7b9daa103fa963b3fd37d8805b23e01621976)

Linux (patch: 0)

Linux (patch: 6.12.78)

Linux (d014538aa38561cd24c5eb228223585f26c5ec71 <a0fc1b9c738fba231f190ab960c83202722efee5)

Linux (5.11)

Linux (patch: 5.15.203)

Linux (patch: 6.18.19)

Linux (d014538aa38561cd24c5eb228223585f26c5ec71 <c59090c50f62a17129fc4c5407bc4071305a9e82)

Linux (patch: 6.1.167)

Linux (patch: 6.19.9)

Linux (patch: 6.6.130)

Linux (d014538aa38561cd24c5eb228223585f26c5ec71 <52db5ef163c96f916d424e472fb17aadc35a9f7a)

Linux (patch: 7.0)

Linux (d014538aa38561cd24c5eb228223585f26c5ec71 <b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b)

Linux (d014538aa38561cd24c5eb228223585f26c5ec71 <25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43)

Linux (d014538aa38561cd24c5eb228223585f26c5ec71 <73a7a345816946d276ad2c46c8bb771de67cfc46)

ENISA description: In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read The q54sj108a2_debugfs_read function suffers from a stack buffer overflow due to incorrect arguments passed to bin2hex(). The function currently passes 'data' as the destination and 'data_char' as the source. Because bin2hex() converts each input byte into two hex characters, a 32-byte block read results in 64 bytes of output. Since 'data' is only 34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end of the buffer onto the stack. Additionally, the arguments were swapped: it was reading from the zero-initialized 'data_char' and writing to 'data', resulting in all-zero output regardless of the actual I2C read. Fix this by: 1. Expanding 'data_char' to 66 bytes to safely hold the hex output. 2. Correcting the bin2hex() argument order and using the actual read count. 3. Using a pointer to select the correct output buffer for the final simple_read_from_buffer call.

EUVD references (7)

Affected products (2)

Vendor	Product	Versions	Platforms
Linux	Linux	`d014538aa38561cd24c5eb228223585f26c5ec71` (affected), `d014538aa38561cd24c5eb228223585f26c5ec71` (affected), `d014538aa38561cd24c5eb228223585f26c5ec71` (affected), `d014538aa38561cd24c5eb228223585f26c5ec71` (affected), `d014538aa38561cd24c5eb228223585f26c5ec71` (affected), `d014538aa38561cd24c5eb228223585f26c5ec71` (affected), `d014538aa38561cd24c5eb228223585f26c5ec71` (affected)	—
Linux	Linux	`5.11` (affected), `0` (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 (3) 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:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*

Vendor references (7)

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

MITRE references (7) 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.

http://cwe.mitre.org/data/definitions/125.html rapid7:cwe.mitre.org
https://attackerkb.com/topics/CVE-2026-43380 rapid7:attackerkb.com
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-28686 rapid7:euvd.enisa.europa.eu
https://www.first.org/epss/ tenable:www.first.org
https://nvd.nist.gov/vuln/detail/CVE-2026-43380 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-43380 tenable:www.cve.org

NVD-tagged references (7)

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

https://git.kernel.org/stable/c/24a7b9daa103fa963b3fd37d8805b23e01621976 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/52db5ef163c96f916d424e472fb17aadc35a9f7a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/73a7a345816946d276ad2c46c8bb771de67cfc46 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/a0fc1b9c738fba231f190ab960c83202722efee5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch
https://git.kernel.org/stable/c/c59090c50f62a17129fc4c5407bc4071305a9e82 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Patch

Remediations (16)

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

RHSB-2026-003 Networking subsystem Privilege Escalation - Linux Kernel ...

web:access.redhat.com

The mitigation methods below address both vulnerabilities that affect Red Hat products — CVE - 2026 -43284 (IPsec ESP) and CVE - 2026 -46300 (XFRM ESP-in-TCP). CVE - 2026 -43500 (rxrpc) does not affect Red Hat products and requires no mitigation .

2026-05-23 21:05 UTC
Zero-Day Threat Report May 2026 - CVEs, Exploits & Remediation ...

web:carthageelectronics.com

Status: Actively exploited — CISA KEV listed — patch by May 12, 2026 What Happened On April 28, 2026 , CISA added CVE - 2026 -32202 to its Known Exploited Vulnerabilities (KEV) catalog with a federal remediation deadline of May 12, 2026 . This vulnerability is the result of an incomplete patch Microsoft released in February for CVE - 2026 -21510.

2026-05-23 21:05 UTC
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
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 21:05 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
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
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.

2026-05-23 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 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 21:05 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 .

2026-05-23 21:05 UTC
Security Updates - Red Hat Customer Portal

web:access.redhat.com

Learn about our open source products, services, and company. You are here

2026-05-26 02:47 UTC
Security Advisory Bulletin 064 | Ubiquiti Community

web:community.ui.com

Published: May 21, 2026 Updated: May 22, 2026 Version: 1.1 Revision: 1.1 Summary 1 of 5 A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection. Affected Products: UniFi OS Server (Version 5.0.6 and earlier) Mitigation : Update your UniFi OS Server to Version 5.0.8 or later ...

2026-05-26 02:47 UTC
Nvd - Cve-2026-43660

web:nvd.nist.gov

An official website of the United States government Here's how you know

2026-05-26 02:47 UTC
Microsoft Patches 138 Vulnerabilities, Including DNS and Netlogon RCE Flaws

web:thehackernews.com

Microsoft patched 138 flaws, including 30 Critical bugs, as AI discovery expands Patch Tuesday risk.

2026-05-26 02:47 UTC
VirusTotal - Home

web:www.virustotal.com

Streamline your investigations with Google Threat Intelligence Agentic and the new Dark Web (DDW) module. Perform hunting and pivoting across forums using natural language or specific modifiers. Bridge threat actor identities and map global operations easy.

2026-05-26 02:47 UTC
I tested Windows 11 March 2026 Updates: Everything new ... - Windows Latest

web:www.windowslatest.com

Windows 11 March 2026 Patch Tuesday update adds Emoji 16.0, Sysmon, network speed test, reliability improvements, and security fixes.

2026-05-26 02:47 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-43380.json.

{
  "containers": {
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          "programFiles": [
            "drivers/hwmon/pmbus/q54sj108a2.c"
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.11"
            },
            {
              "lessThan": "5.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
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            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
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            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
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            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.19",
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            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "vulnerable": true
                },
                {
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              "negate": false,
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read\n\nThe q54sj108a2_debugfs_read function suffers from a stack buffer overflow\ndue to incorrect arguments passed to bin2hex(). The function currently\npasses 'data' as the destination and 'data_char' as the source.\n\nBecause bin2hex() converts each input byte into two hex characters, a\n32-byte block read results in 64 bytes of output. Since 'data' is only\n34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end\nof the buffer onto the stack.\n\nAdditionally, the arguments were swapped: it was reading from the\nzero-initialized 'data_char' and writing to 'data', resulting in\nall-zero output regardless of the actual I2C read.\n\nFix this by:\n1. Expanding 'data_char' to 66 bytes to safely hold the hex output.\n2. Correcting the bin2hex() argument order and using the actual read count.\n3. Using a pointer to select the correct output buffer for the final\n   simple_read_from_buffer call."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:23:28.160Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b"
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43"
        }
      ],
      "title": "hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43380",
    "datePublished": "2026-05-08T14:21:28.702Z",
    "dateReserved": "2026-05-01T14:12:56.006Z",
    "dateUpdated": "2026-05-11T22:23:28.160Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}