CVE-2026-43495

Description

In the Linux kernel, the following vulnerability has been resolved: net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler t7xx_port_enum_msg_handler() uses the modem-supplied port_count field as a loop bound over port_msg->data[] without checking that the message buffer contains sufficient data. A modem sending port_count=65535 in a 12-byte buffer triggers a slab-out-of-bounds read of up to 262140 bytes. Add a sizeof(*port_msg) check before accessing the port message header fields to guard against undersized messages. Add a struct_size() check after extracting port_count and before the loop. In t7xx_parse_host_rt_data(), guard the rt_feature header read with a remaining-buffer check before accessing data_len, validate feat_data_len against the actual remaining buffer to prevent OOB reads and signed integer overflow on offset. Pass msg_len from both call sites: skb->len at the DPMAIF path after skb_pull(), and the validated feat_data_len at the handshake path.

Overview

State: PUBLISHED
Assigner (CNA): Linux
CVSS severity: high
CVSS score: 8.8 / 10
CVSS vector: AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Effective score: 8.8 / 10 HIGH source: CNA overview
MSRC score: 6.5 / 10 MEDIUM MS rating: Moderate
CWE(s): —
Reserved: 2026-05-01
Published: 2026-05-21 12:12 UTC
Last updated: 2026-05-21 12:12 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43495.json
Linked Threat: CVE-2026-43495 — CVE-2026-43495

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: 2026-05-21 13:16:18 UTC
NVD last modified: 2026-05-21 13:16:18 UTC
EPSS score: 0.0002 (probability of exploitation in next 30 days)
EPSS percentile: 7.22% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

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-2026-31271
Assigner: Linux
Published: May 21, 2026, 12:12:45 PM
Updated: May 30, 2026, 10:45:12 AM
EUVD base score (CVSS 3.1): 8.8 / 10
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EUVD-reported EPSS: 0.0200
Vendors: Linux
Products: Linux (patch: 0)

Linux (5.19)

Linux (da45d2566a1d4e260b894ff5d96be64b21c7fa79 <9855e063e063158cc5bded576382599dc3133202)

Linux (patch: 7.0.7)

Linux (da45d2566a1d4e260b894ff5d96be64b21c7fa79 <dd4f4c93c1488d7100b9964f2da4c8b3c29652f1)

Linux (da45d2566a1d4e260b894ff5d96be64b21c7fa79 <0e7c074cfcd9bd93765505f9eb8b42f03ed2a744)

Linux (da45d2566a1d4e260b894ff5d96be64b21c7fa79 <f94450ce5053b36002995b72d1fa1db3bb08c5bf)

Linux (patch: 6.6.140)

Linux (da45d2566a1d4e260b894ff5d96be64b21c7fa79 <2b56d7903ab804481f5233a259d5f341e9fd513c)

Linux (patch: 7.1-rc3)

Linux (patch: 6.18.30)

Linux (patch: 6.12.88)
Aliases: GHSA-mhw6-p52x-6vxv

ENISA description: In the Linux kernel, the following vulnerability has been resolved: net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler t7xx_port_enum_msg_handler() uses the modem-supplied port_count field as a loop bound over port_msg->data[] without checking that the message buffer contains sufficient data. A modem sending port_count=65535 in a 12-byte buffer triggers a slab-out-of-bounds read of up to 262140 bytes. Add a sizeof(*port_msg) check before accessing the port message header fields to guard against undersized messages. Add a struct_size() check after extracting port_count and before the loop. In t7xx_parse_host_rt_data(), guard the rt_feature header read with a remaining-buffer check before accessing data_len, validate feat_data_len against the actual remaining buffer to prevent OOB reads and signed integer overflow on offset. Pass msg_len from both call sites: skb->len at the DPMAIF path after skb_pull(), and the validated feat_data_len at the handshake path.

EUVD references (5)

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-08-12 01:09 UTC (source: CVRF).

MS severity: Moderate
MS CVSS base score: 6.5 / 10 (temporal 6.5)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Release: 2026-May

Affected products (2)

Vendor	Product	Versions	Platforms
Linux	Linux	`da45d2566a1d4e260b894ff5d96be64b21c7fa79` (affected), `da45d2566a1d4e260b894ff5d96be64b21c7fa79` (affected), `da45d2566a1d4e260b894ff5d96be64b21c7fa79` (affected), `da45d2566a1d4e260b894ff5d96be64b21c7fa79` (affected), `da45d2566a1d4e260b894ff5d96be64b21c7fa79` (affected)	—
Linux	Linux	`5.19` (affected), `0` (unaffected), `6.6.140` (unaffected), `6.12.88` (unaffected), `6.18.30` (unaffected), `7.0.7` (unaffected), `7.1-rc3` (unaffected)	—

Vendor references (5)

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

MITRE references (1) cveawg.mitre.org

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

https://git.kernel.org/stable/c/307c5d0f36a5c74042217136da5bfbd9f7504650

Web references (9)

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

MSRC update guide: CVE-2026-43495 msrc
https://git.kernel.org/stable/c/9855e063e063158cc5bded576382599dc3133202 tenable:git.kernel.org
https://git.kernel.org/stable/c/dd4f4c93c1488d7100b9964f2da4c8b3c29652f1 tenable:git.kernel.org
https://git.kernel.org/stable/c/f94450ce5053b36002995b72d1fa1db3bb08c5bf tenable:git.kernel.org
https://nvd.nist.gov/vuln/detail/CVE-2026-43495 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-43495 tenable:www.cve.org
https://git.kernel.org/stable/c/0e7c074cfcd9bd93765505f9eb8b42f03ed2a744 tenable:git.kernel.org
https://www.first.org/epss/ tenable:www.first.org
https://git.kernel.org/stable/c/2b56d7903ab804481f5233a259d5f341e9fd513c tenable:git.kernel.org

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.

https://git.kernel.org/stable/c/0e7c074cfcd9bd93765505f9eb8b42f03ed2a744 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/2b56d7903ab804481f5233a259d5f341e9fd513c 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/9855e063e063158cc5bded576382599dc3133202 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/dd4f4c93c1488d7100b9964f2da4c8b3c29652f1 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/f94450ce5053b36002995b72d1fa1db3bb08c5bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Remediations (17)

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

April 2026 Critical Patch Update Released | security - Oracle Blogs

web:blogs.oracle.com

For more information about the Critical Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.

2026-05-24 12:02 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 .

2026-05-24 12:02 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.

2026-05-24 12:02 UTC
KB4073119: Windows client guidance for IT Pros to protect against ...

web:support.microsoft.com

Provides Windows client guidance for IT Pros to protect against speculative execution side-channel vulnerabilities.

2026-05-24 12:02 UTC
Landing Page | ServiceNow Common Vulnerabilities & Exposures (CVE ...

web:support.servicenow.com

Overview The advisories below document publicly disclosed Common Vulnerabilities and Exposures ( CVEs ) in the Now Platform by ServiceNow. Because ServiceNow uses various methods to communicate vulnerability information, patches, and other fixes, customers should review family, security patch , and hotfix release notes, which are available at https://docs.servicenow.com, for a complete list of ...

2026-05-24 12:02 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.

2026-05-24 12:02 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.

2026-05-24 12:02 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.

2026-05-24 12:02 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.

2026-05-24 12:02 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 .

2026-05-24 12:02 UTC
Microsoft Patch Tuesday May 2026 - 120 Vulnerabilities Fixed, Including ...

web:cybersecuritynews.com

Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.

2026-06-03 22:32 UTC
Google's June 2026 Android Patch: 124 Flaws Addressed, Zero ... - IPLogger

web:iplogger.org

Proactive Mitigation Strategies and Incident Response For individuals and enterprises alike, immediate action is crucial: Timely Patch Deployment: Users should update their Android devices as soon as the June 2026 security patch becomes available for their specific device model and carrier.

2026-06-03 22:32 UTC
CVE-2025-48595: June 2026 Android Security Update Fixes Framework Zero-Day

web:socradar.io

Google's June 2026 Android Security Bulletin includes a fix for an Android Framework elevation of privilege zero-day tracked as CVE -2025-48595. Google noted the issue "may be under limited, targeted exploitation," which raises the priority for teams managing Android fleets. The bulletin ships two patch levels, 2026 -06-01 and 2026 -06-05, with the latter bundling additional partner, device ...

2026-06-03 22:32 UTC
Android Security Bulletin—March 2025 - Android Open Source Project

web:source.android.com

Android partners are encouraged to fix all issues in this bulletin and use the latest security patch level. Devices that use the 2025-03-01 security patch level must include all issues associated with that security patch level, as well as fixes for all issues reported in previous security bulletins.

2026-06-03 22:32 UTC
Android Security Bulletin—August 2025 - Android Open Source Project

web:source.android.com

Android partners are encouraged to fix all issues in this bulletin and use the latest security patch level. Devices that use the 2025-08-01 security patch level must include all issues associated with that security patch level, as well as fixes for all issues reported in previous security bulletins.

2026-06-03 22:32 UTC
CVE-2025-48595 Fixed In Android June 2026 Security Update

web:thecyberexpress.com

Google's June 2026 Android update patches 124 flaws, including exploited zero-day CVE -2025-48595 affecting Android 14, 15 and 16.

2026-06-03 22:32 UTC
Google June 2026 Android Update Patches 124 Flaws, One Actively Exploited

web:thehackernews.com

Google patched 124 Android flaws in June 2026 , including exploited CVE -2025-48595, reducing privilege-escalation risks.

2026-06-03 22:32 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-43495.json.

{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wwan/t7xx/t7xx_modem_ops.c",
            "drivers/net/wwan/t7xx/t7xx_port_ctrl_msg.c",
            "drivers/net/wwan/t7xx/t7xx_port_proxy.h"
          ],
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            },
            {
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              "versionType": "original_commit_for_fix"
            }
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        }
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler\n\nt7xx_port_enum_msg_handler() uses the modem-supplied port_count field as\na loop bound over port_msg->data[] without checking that the message buffer\ncontains sufficient data. A modem sending port_count=65535 in a 12-byte\nbuffer triggers a slab-out-of-bounds read of up to 262140 bytes.\n\nAdd a sizeof(*port_msg) check before accessing the port message header\nfields to guard against undersized messages.\n\nAdd a struct_size() check after extracting port_count and before the loop.\n\nIn t7xx_parse_host_rt_data(), guard the rt_feature header read with a\nremaining-buffer check before accessing data_len, validate feat_data_len\nagainst the actual remaining buffer to prevent OOB reads and signed\ninteger overflow on offset.\n\nPass msg_len from both call sites: skb->len at the DPMAIF path after\nskb_pull(), and the validated feat_data_len at the handshake path."
        }
      ],
      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/0e7c074cfcd9bd93765505f9eb8b42f03ed2a744"
        }
      ],
      "title": "net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler",
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    "datePublished": "2026-05-21T12:12:45.988Z",
    "dateReserved": "2026-05-01T14:12:56.013Z",
    "dateUpdated": "2026-05-21T12:12:45.988Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}